docs: update readme for @idraw/renderer

packages/renderer/README.md

@@ -1,3 +1,68 @@
 # @idraw/renderer
 
-[![Node.js CI](https://github.com/idrawjs/idraw/actions/workflows/node.js.yml/badge.svg?branch=main)](https://github.com/idrawjs/idraw/actions/workflows/node.js.yml)
+[![Node.js CI](https://github.com/idrawjs/idraw/actions/workflows/node.js.yml/badge.svg?branch=main)](https://github.com/idrawjs/idraw/actions/workflows/node.js.yml)
+
+
+## Usage
+
+### Quick Start
+
+```sh
+npm i @idraw/renderer
+```
+
+```js
+import Renderer from '@idraw/renderer';
+
+const renderer = new Renderer({
+  width: 600,
+  height: 400,
+  contextWidth: 600,
+  contextHeight: 400,
+  devicePixelRatio: 1,
+});
+
+const canvas = document.querySelector('canvas');
+renderer.render(canvas, {
+  elements: [
+    {
+      name: "rect-001",
+      x: 10,
+      y: 10,
+      w: 200,
+      h: 100,
+      type: "rect",
+      desc: {
+        bgColor: "#f0f0f0",
+        borderRadius: 20,
+        borderWidth: 10,
+        borderColor: "#bd0b64",
+      },
+    },
+  ]
+})
+
+```
+
+### Events
+
+```js
+renderer.on('load', (e) => {
+  // ...
+})
+renderer.on('loadComplete', (e) => {
+  // ...
+})
+
+renderer.on('drawFrame', (e) => {
+  // ...
+})
+renderer.on('drawFrameComplete', (e) => {
+  // ...
+})
+```
+
+## Documents
+
+- [Documents](https://idraw.js.org/docs/en/) | [中文文档](https://idraw.js.org/docs/zh/) 
+- [Online Playground](https://idraw.js.org/playground/) | [在线API示例](https://idraw.js.org/playground/)