chore: storage readme

README.md

@@ -1,4 +1,87 @@
 # csharp-sdk
-LeanCloud C# SDK
+
+LeanCloud 数据存储，即时通讯 C# SDK，基于 .Net Standard 2.0 标准开发。
+
+## 安装
+
+从 [Release](https://github.com/leancloud/csharp-sdk/releases) 下载指定版本 SDK，暂不支持 Nuget 方式。
+
+## 导入
+
+```csharp
+using LeanCloud;
+// 数据存储
+using LeanCloud.Storage;
+// 即时通讯
+using LeanCloud.Realtime;
+```
+
+## 初始化
+
+```csharp
+LCApplication.Initialize("ikGGdRE2YcVOemAaRbgp1xGJ-gzGzoHsz", "NUKmuRbdAhg1vrb2wexYo1jo", "https://ikggdre2.lc-cn-n1-shared.com");
+```
+
+## 调试
+
+开启调试日志
+
+```csharp
+LCLogger.LogDelegate += (level, info) => {
+    switch (level) {
+        case LCLogLevel.Debug:
+            WriteLine($"[DEBUG] {DateTime.Now} {info}\n");
+            break;
+        case LCLogLevel.Warn:
+            WriteLine($"[WARNING] {DateTime.Now} {info}\n");
+            break;
+        case LCLogLevel.Error:
+            WriteLine($"[ERROR] {DateTime.Now} {info}\n");
+            break;
+        default:
+            WriteLine(info);
+            break;
+    }
+}
+```
+
+## 用法
+
+### 对象
+
+```csharp
+LCObject obj = new LCObject("Hello");
+obj["intValue"] = 123;
+await obj.Save();
+```
+
+### 查询
+
+```csharp
+LCQuery<LCObject> query = new LCQuery<LCObject>("Hello");
+query.Limit(2);
+List<LCObject> list = await query.Find();
+```
+
+### 文件
+
+```csharp
+LCFile file = new LCFile("avatar", AvatarFilePath);
+await file.Save((count, total) => {
+    TestContext.WriteLine($"progress: {count}/{total}");
+});
+```
+
+### 用户
+
+```csharp
+await LCUser.Login("hello", "world");
+```
+
+### GeoPoint
+
+```csharp
+LCGeoPoint p1 = new LCGeoPoint(20.0059, 110.3665);
+```
 
 [API 文档](https://leancloud.github.io/csharp-sdk/html/index.html)