Add about page

examples/gatsbygram/pages/about.js

@@ -0,0 +1,15 @@
+import React from "react"
+
+class About extends React.Component {
+  render () {
+    return (
+      <div>
+        <h1>About Gatsbygram</h1>
+        <p>Gatsbygram is an example website built with the JavaScript web framework <a target="_blank" href="https://github.com/gatsbyjs/gatsby">Gatsby</a></p>
+        <p>The code for the site lives at <a href="https://github.com/gatsbyjs/gatsby/tree/1.0/examples/gatsbygram" target="_blank">https://github.com/gatsbyjs/gatsby/tree/1.0/examples/gatsbygram</a></p>
+      </div>
+    )
+  }
+}
+
+export default About