新增uts插件调用uni api文档

docs/plugin/uts-uni-api.md

+# UTS中使用uni api  
+> 需HBuilderX 3.8.0 及以上版本
+
+uts插件代码中可以直接调用uni api
+
+## 示例  
+```ts
+export function myToast() {
+	uni.showToast({
+		title: 'This is toast in uts with uni API!',
+		success: function(){
+			console.log('uni.showToast success!');
+		},
+		fail: (err) => {
+			console.log('uni.showToast success: ', err);
+		}
+	});
+}
+```
+
+
+## 注意事项  
+### 异步API中complete回调函数中的参数是any类型  
+在uts中，由于不支持联合类型，complete回调函数的参数会当做any类型处理。  
+any类型对象不能直接使用“.”访问其属性，目前暂时可以使用JSON.stringify()转换为字符串处理。
+如下示例：
+```ts
+export function myTest() {
+	uni.request({
+		url: 'https://www.invalidserviceaddress.com/',
+		complete: (res) => {
+			//res为any类型，转换为字符串处理
+			let ret = JSON.stringify(res);
+			console.log(ret);
+		}
+	});
+}
+```
+
+
+## 支持的API列表  
+### 网络  
+- [uni.request(OBJECT)](https://uniapp.dcloud.net.cn/api/request/request.html#request)  
+	传输数据暂不支持ArrayBuffer类型  
+
+### 数据缓存  
+- [uni.setStorage(OBJECT)](https://uniapp.dcloud.net.cn/api/storage/storage.html#setstorage)  
+- [uni.setStorageSync(KEY,DATA)](https://uniapp.dcloud.net.cn/api/storage/storage.html#setstoragesync)  
+- [uni.getStorage(OBJECT)](https://uniapp.dcloud.net.cn/api/storage/storage.html#getstorage)  
+- [uni.getStorageSync(KEY)](https://uniapp.dcloud.net.cn/api/storage/storage.html#getstoragesync)  
+- [uni.getStorageInfo(OBJECT)](https://uniapp.dcloud.net.cn/api/storage/storage.html#getstorageinfo)  
+- [uni.getStorageInfoSync()](https://uniapp.dcloud.net.cn/api/storage/storage.html#getstorageinfosync)  
+- [uni.removeStorage(OBJECT)](https://uniapp.dcloud.net.cn/api/storage/storage.html#removestorage)  
+- [uni.removeStorageSync(KEY)](https://uniapp.dcloud.net.cn/api/storage/storage.html#removestoragesync)  
+- [uni.clearStorage()](https://uniapp.dcloud.net.cn/api/storage/storage.html#clearstorage)
+- [uni.clearStorageSync()](https://uniapp.dcloud.net.cn/api/storage/storage.html#clearstoragesync)  
+
+### 设备  
+- 系统  
+	+ [uni.getDeviceInfo()](https://uniapp.dcloud.net.cn/api/system/getDeviceInfo.html)  
+	+ [uni.getSystemSetting()](https://uniapp.dcloud.net.cn/api/system/getsystemsetting.html)
+
+### 界面  
+- 交互反馈  
+	+ [uni.showToast(OBJECT)](https://uniapp.dcloud.net.cn/api/ui/prompt.html#showtoast)  
+	+ [uni.hideToast()](https://uniapp.dcloud.net.cn/api/ui/prompt.html#hidetoast)  
+	+ [uni.showLoading(OBJECT)](https://uniapp.dcloud.net.cn/api/ui/prompt.html#showloading)  
+	+ [uni.hideLoading()](https://uniapp.dcloud.net.cn/api/ui/prompt.html#hideloading)  
+	+ [uni.showModal(OBJECT)](https://uniapp.dcloud.net.cn/api/ui/prompt.html#showmodal)  
+	+ [uni.showActionSheet(OBJECT)](https://uniapp.dcloud.net.cn/api/ui/prompt.html#showactionsheet)