update readme

Author: crossoverJie

README.md

@@ -71,10 +71,11 @@ Using `CIM`, you can achieve the following requirements:
 
 ![](pic/architecture.png)
 
-- `CIM` 中的各个组件均采用 `SpringBoot` 构建。
--  采用 `Netty` 构建底层通信。
--  `Redis` 存放各个客户端的路由信息、账号信息、在线状态等。
--  `Zookeeper` 用于 `IM-server` 服务的注册与发现。
+translate to english
+- Each component in `CIM` is built using `SpringBoot`
+  - Client build with [cim-client-sdk](https://github.com/crossoverJie/cim/tree/master/cim-client-sdk)
+- Use `Netty` to build the underlying communication.
+- `MetaStore` is used for registration and discovery of `IM-server` services.
 
 
 ### cim-server

cim-client-sdk/README.md

@@ -0,0 +1,20 @@
+
+```java
+Client client1 = Client.builder()
+                .auth(auth1)
+                .routeUrl(routeUrl)
+                .build();
+
+ClientState.State state = client1.getState();
+Awaitility.await().atMost(10, TimeUnit.SECONDS)
+.untilAsserted(() -> Assertions.assertEquals(ClientState.State.Ready, state));
+Optional<CIMServerResVO> serverInfo = client1.getServerInfo();
+Assertions.assertTrue(serverInfo.isPresent());
+
+// send msg
+String msg = "hello";
+client1.sendGroup(msg);
+
+// get oline user
+Set<CIMUserInfo> onlineUser = client1.getOnlineUser();
+```