Add missing component code.

src/components/chat/chat.js

@@ -0,0 +1,26 @@
+const chat = {
+  data () {
+    return {
+      messages: [],
+      currentMessage: '',
+      socket: this.$store.state.users.socket,
+      channel: null
+    }
+  },
+  created () {
+    this.channel = this.socket.channel('chat:public')
+    this.channel.on('new_msg', (msg) => {
+      this.messages.push(msg)
+      this.messages = this.messages.slice(-19, 20)
+    })
+    this.channel.join()
+  },
+  methods: {
+    submit(message) {
+      this.channel.push('new_msg', {text: message}, 10000)
+      this.currentMessage = '';
+    }
+  }
+}
+
+export default chat;