feat(storybook): add example storybook

src/stories/Button.stories.tsx

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+import React from 'react';
+// also exported from '@storybook/react' if you can deal with breaking changes in 6.1
+import { Story, Meta } from '@storybook/react/types-6-0';
+
+import { Button, ButtonProps } from './Button';
+
+export default {
+  title: 'Example/Button',
+  component: Button,
+  argTypes: {
+    backgroundColor: { control: 'color' },
+  },
+} as Meta;
+
+const Template: Story<ButtonProps> = (args) => <Button {...args} />;
+
+export const Primary = Template.bind({});
+Primary.args = {
+  primary: true,
+  label: 'Button',
+};
+
+export const Secondary = Template.bind({});
+Secondary.args = {
+  label: 'Button',
+};
+
+export const Large = Template.bind({});
+Large.args = {
+  size: 'large',
+  label: 'Button',
+};
+
+export const Small = Template.bind({});
+Small.args = {
+  size: 'small',
+  label: 'Button',
+};

src/stories/Button.tsx

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+import React from 'react'
+import './button.css'
+
+export interface ButtonProps {
+  /**
+   * Is this the principal call to action on the page?
+   */
+  primary?: boolean
+  /**
+   * What background color to use
+   */
+  backgroundColor?: string
+  /**
+   * How large should the button be?
+   */
+  size?: 'small' | 'medium' | 'large'
+  /**
+   * Button contents
+   */
+  label: string
+  /**
+   * Optional click handler
+   */
+  onClick?: () => void
+  hehehe?: string
+}
+
+/**
+ * Primary UI component for user interaction
+ */
+export const Button: React.FC<ButtonProps> = ({
+  primary = false,
+  size = 'medium',
+  backgroundColor,
+  label,
+  ...props
+}: ButtonProps) => {
+  const mode = primary
+    ? 'storybook-button--primary'
+    : 'storybook-button--secondary'
+  return (
+    <button
+      type="button"
+      className={['storybook-button', `storybook-button--${size}`, mode].join(
+        ' ',
+      )}
+      style={{ backgroundColor }}
+      {...props}
+    >
+      {label}
+    </button>
+  )
+}

src/stories/Header.stories.tsx

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+import React from 'react';
+// also exported from '@storybook/react' if you can deal with breaking changes in 6.1
+import { Story, Meta } from '@storybook/react/types-6-0';
+
+import { Header, HeaderProps } from './Header';
+
+export default {
+  title: 'Example/Header',
+  component: Header,
+} as Meta;
+
+const Template: Story<HeaderProps> = (args) => <Header {...args} />;
+
+export const LoggedIn = Template.bind({});
+LoggedIn.args = {
+  user: {},
+};
+
+export const LoggedOut = Template.bind({});
+LoggedOut.args = {};

src/stories/Header.tsx

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+import React from 'react';
+
+import { Button } from './Button';
+import './header.css';
+
+export interface HeaderProps {
+  user?: {};
+  onLogin: () => void;
+  onLogout: () => void;
+  onCreateAccount: () => void;
+}
+
+export const Header: React.FC<HeaderProps> = ({ user, onLogin, onLogout, onCreateAccount }) => (
+  <header>
+    <div className="wrapper">
+      <div>
+        <svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+          <g fill="none" fillRule="evenodd">
+            <path
+              d="M10 0h12a10 10 0 0110 10v12a10 10 0 01-10 10H10A10 10 0 010 22V10A10 10 0 0110 0z"
+              fill="#FFF"
+            />
+            <path
+              d="M5.3 10.6l10.4 6v11.1l-10.4-6v-11zm11.4-6.2l9.7 5.5-9.7 5.6V4.4z"
+              fill="#555AB9"
+            />
+            <path
+              d="M27.2 10.6v11.2l-10.5 6V16.5l10.5-6zM15.7 4.4v11L6 10l9.7-5.5z"
+              fill="#91BAF8"
+            />
+          </g>
+        </svg>
+        <h1>Acme</h1>
+      </div>
+      <div>
+        {user ? (
+          <Button size="small" onClick={onLogout} label="Log out" />
+        ) : (
+          <>
+            <Button size="small" onClick={onLogin} label="Log in" />
+            <Button primary size="small" onClick={onCreateAccount} label="Sign up" />
+          </>
+        )}
+      </div>
+    </div>
+  </header>
+);

src/stories/Introduction.stories.mdx

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+import { Meta } from '@storybook/addon-docs/blocks';
+import Code from './assets/code-brackets.svg';
+import Colors from './assets/colors.svg';
+import Comments from './assets/comments.svg';
+import Direction from './assets/direction.svg';
+import Flow from './assets/flow.svg';
+import Plugin from './assets/plugin.svg';
+import Repo from './assets/repo.svg';
+import StackAlt from './assets/stackalt.svg';
+
+<Meta title="Example/Introduction" />
+
+<style>{`
+  .subheading {
+    --mediumdark: '#999999';
+    font-weight: 900;
+    font-size: 13px;
+    color: #999;
+    letter-spacing: 6px;
+    line-height: 24px;
+    text-transform: uppercase;
+    margin-bottom: 12px;
+    margin-top: 40px;
+  }
+
+  .link-list {
+    display: grid;
+    grid-template-columns: 1fr;
+    grid-template-rows: 1fr 1fr;
+    row-gap: 10px;
+  }
+
+  @media (min-width: 620px) {
+    .link-list {
+      row-gap: 20px;
+      column-gap: 20px;
+      grid-template-columns: 1fr 1fr;
+    }
+  }
+
+  @media all and (-ms-high-contrast:none) {
+  .link-list {
+      display: -ms-grid;
+      -ms-grid-columns: 1fr 1fr;
+      -ms-grid-rows: 1fr 1fr;
+    }
+  }
+
+  .link-item {
+    display: block;
+    padding: 20px 30px 20px 15px;
+    border: 1px solid #00000010;
+    border-radius: 5px;
+    transition: background 150ms ease-out, border 150ms ease-out, transform 150ms ease-out;
+    color: #333333;
+    display: flex;
+    align-items: flex-start;
+  }
+
+  .link-item:hover {
+    border-color: #1EA7FD50;
+    transform: translate3d(0, -3px, 0);
+    box-shadow: rgba(0, 0, 0, 0.08) 0 3px 10px 0;
+  }
+
+  .link-item:active {
+    border-color: #1EA7FD;
+    transform: translate3d(0, 0, 0);
+  }
+
+  .link-item strong {
+    font-weight: 700;
+    display: block;
+    margin-bottom: 2px;
+  }
+
+  .link-item img {
+    height: 40px;
+    width: 40px;
+    margin-right: 15px;
+    flex: none;
+  }
+
+  .link-item span {
+    font-size: 14px;
+    line-height: 20px;
+  }
+
+  .tip {
+    display: inline-block;
+    border-radius: 1em;
+    font-size: 11px;
+    line-height: 12px;
+    font-weight: 700;
+    background: #E7FDD8;
+    color: #66BF3C;
+    padding: 4px 12px;
+    margin-right: 10px;
+    vertical-align: top;
+  }
+
+  .tip-wrapper {
+    font-size: 13px;
+    line-height: 20px;
+    margin-top: 40px;
+    margin-bottom: 40px;
+  }
+
+  .tip-wrapper code {
+    font-size: 12px;
+    display: inline-block;
+  }
+
+
+`}</style>
+
+# Welcome to Storybook
+
+Storybook helps you build UI components in isolation from your app's business logic, data, and context.
+That makes it easy to develop hard-to-reach states. Save these UI states as **stories** to revisit during development, testing, or QA.
+
+Browse example stories now by navigating to them in the sidebar.
+View their code in the `src/stories` directory to learn how they work.
+We recommend building UIs with a [**component-driven**](https://componentdriven.org) process starting with atomic components and ending with pages.
+
+<div className="subheading">Configure</div>
+
+<div className="link-list">
+  <a className="link-item" href="https://storybook.js.org/docs/react/addons/addon-types" target="_blank">
+    <img src={Plugin} alt="plugin" />
+    <span>
+      <strong>Presets for popular tools</strong>
+      Easy setup for TypeScript, SCSS and more.
+    </span>
+  </a>
+  <a
+    className="link-item"
+    href="https://storybook.js.org/docs/react/configure/webpack"
+    target="_blank"
+  >
+    <img src={StackAlt} alt="Build" />
+    <span>
+      <strong>Build configuration</strong>
+      How to customize webpack and Babel
+    </span>
+  </a>
+  <a
+    className="link-item"
+    href="https://storybook.js.org/docs/react/configure/styling-and-css"
+    target="_blank"
+  >
+    <img src={Colors} alt="colors" />
+    <span>
+      <strong>Styling</strong>
+      How to load and configure CSS libraries
+    </span>
+  </a>
+  <a
+    className="link-item"
+    href="https://storybook.js.org/docs/react/get-started/setup#configure-storybook-for-your-stack"
+    target="_blank"
+  >
+    <img src={Flow} alt="flow" />
+    <span>
+      <strong>Data</strong>
+      Providers and mocking for data libraries
+    </span>
+  </a>
+</div>
+
+<div className="subheading">Learn</div>
+
+<div className="link-list">
+  <a className="link-item" href="https://storybook.js.org/docs" target="_blank">
+    <img src={Repo} alt="repo" />
+    <span>
+      <strong>Storybook documentation</strong>
+      Configure, customize, and extend
+    </span>
+  </a>
+  <a className="link-item" href="https://www.learnstorybook.com" target="_blank">
+    <img src={Direction} alt="direction" />
+    <span>
+      <strong>In-depth guides</strong>
+      Best practices from leading teams
+    </span>
+  </a>
+  <a className="link-item" href="https://github.com/storybookjs/storybook" target="_blank">
+    <img src={Code} alt="code" />
+    <span>
+      <strong>GitHub project</strong>
+      View the source and add issues
+    </span>
+  </a>
+  <a className="link-item" href="https://discord.gg/UUt2PJb" target="_blank">
+    <img src={Comments} alt="comments" />
+    <span>
+      <strong>Discord chat</strong>
+      Chat with maintainers and the community
+    </span>
+  </a>
+</div>
+
+<div className="tip-wrapper">
+  <span className="tip">Tip</span>Edit the Markdown in{' '}
+  <code>src/stories/Introduction.stories.mdx</code>
+</div>

src/stories/Page.stories.tsx

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+import React from 'react';
+// also exported from '@storybook/react' if you can deal with breaking changes in 6.1
+import { Story, Meta } from '@storybook/react/types-6-0';
+
+import { Page, PageProps } from './Page';
+import * as HeaderStories from './Header.stories';
+
+export default {
+  title: 'Example/Page',
+  component: Page,
+} as Meta;
+
+const Template: Story<PageProps> = (args) => <Page {...args} />;
+
+export const LoggedIn = Template.bind({});
+LoggedIn.args = {
+  ...HeaderStories.LoggedIn.args,
+};
+
+export const LoggedOut = Template.bind({});
+LoggedOut.args = {
+  ...HeaderStories.LoggedOut.args,
+};