feat: 更新sdk说明文档

README.md

@@ -7,6 +7,13 @@
 `git subtree pull --prefix=starCloud git@code.star-lock.cn:xhj/starcloud-sdk-uniapp.git master`
 ### 2. 需安装的npm包
 `npm install buffer crc js-md5 pinia sm-crypto`
+
+pinia是全局状态管理工具，需在main.js中引入
+```javascript
+import * as Pinia from 'pinia'
+const store = Pinia.createPinia()
+app.use(store)
+```
 ### 3. 使用
 ```javascript 
 import { useStarCloudStore } from '@/starCloud/starCloud'