update README

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-karyon jsonrpc client, written in go.
diff --git a/README.md b/README.md
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+
+# Karyon-go
+
+karyon jsonrpc client, written in go.
+
+## Example 
+
+```go
+
+import (
+	rpc "github.com/karyontech/karyon-go/jsonrpc/client"
+)
+
+config := rpc.RPCClientConfig{
+	Addr: "ws://127.0.0.1:6000",
+}
+
+client, err := rpc.NewRPCClient(config)
+if err != nil {
+	log.Fatal(err)
+}
+defer client.Close()
+
+subID, ch, err := client.Subscribe("RPCService.log_subscribe", nil)
+if err != nil {
+	log.Fatal(err)
+}
+log.Infof("Subscribed successfully: %d\n", subID)
+
+go func() {
+	for notification := range ch {
+		log.Infof("Receive new notification: %s\n", notification)
+	}
+}()
+
+_, err := client.Call("RPCService.ping", nil)
+if err != nil {
+	log.Fatal(err)
+}
+```
+
+