docs: add import hints to readme (#586)

Author: ifedapoolarewaju

README.md

@@ -51,7 +51,11 @@ Please use the lastest version of socket.io 2.x: [socket.io 2.3.0](https://www.n
 Socket.IO-client Java has almost the same api and features with the original JS client. You use `IO#socket` to initialize `Socket`:
 
 ```java
-socket = IO.socket("http://localhost");
+import io.socket.client.IO;
+import io.socket.client.Socket;
+...
+
+Socket socket = IO.socket("http://localhost");
 socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
 
   @Override