doc: update README

README.md

@@ -1,3 +1,38 @@
 # Cyber App SDK
 
 Create a CyberWallet app easily with Cyber App SDK.
+
+## Installation
+
+```bash
+npm install cyber-app-sdk
+```
+
+## Getting Started
+
+### Connect to CyberWallet
+
+```javascript
+import { CyberApp } from "@cyberlab/cyber-app-sdk";
+
+const app = new CyberApp({ name: "testapp" });
+const { connected } = await app.start();
+
+if (connected) {
+  console.log("Connected to CyberWallet");
+} else {
+  console.log("Connection to CyberWallet failed");
+}
+```
+
+### Send a transaction
+
+```javascript
+const res = await app?.cyberWallet
+  ?.sendTransaction({
+    to: address,
+    value: parseUnits("0.0001", 18),
+    data: "0x",
+  })
+  .catch((err: any) => console.log({ err }));
+```