Added text chat functionality

server.js

@@ -45,6 +45,12 @@ io.on('connection', socket => {
             io.to(user.room).emit('updateGameState', gameState)
     })
 
+    socket.on('sendMessage', (payload, callback) => {
+        const user = getUser(socket.id)
+        io.to(user.room).emit('message', {user: user.name, text: payload.message})
+        callback()
+    })
+
     socket.on('disconnect', () => {
         const user = removeUser(socket.id)
         if(user)