Update ServerConnectionHandler.java

added Commment for documentation.

server/src/main/java/ch/zhaw/pm2/multichat/server/ServerConnectionHandler.java

@@ -149,6 +149,9 @@ public class ServerConnectionHandler implements Runnable{
                     ServerConnectionHandler handler = connectionRegistry.get(reciever);
                     if (handler != null) {
                         handler.sendData(sender, reciever, type, payload);
+                        if(!reciever.equals(sender)){
+                            sendData(sender, reciever, type, payload); //send message to sender if it's a direct message and sender is not receiver.
+                        }
                     } else {
                         this.sendData(USER_NONE, userName, DATA_TYPE_ERROR, "Unknown User: " + reciever);
                     }