Add basic multiplayer

frontend/src/scripts/commands/receivers/command-receiver-socket.ts

@@ -0,0 +1,11 @@
+import { Command, CommandReceiver, TransportEvents } from 'shared';
+
+export class CommandReceiverSocket extends CommandReceiver {
+  constructor(private readonly socket: SocketIOClient.Socket) {
+    super();
+  }
+
+  protected defaultCommandExecutor(command: Command) {
+    this.socket.emit(TransportEvents.PlayerToServer, JSON.stringify(command));
+  }
+}