start of message service

src/app/services/message.service.ts

@@ -0,0 +1,14 @@
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class MessageService {
+  messages: string[] = [];
+
+  add(message: string) {
+    this.messages.push(message);
+  }
+
+  clear() {
+    this.messages = [];
+  }
+}