Added login navigation guard

frontend/src/app/component/tweets/tweets.component.html

@@ -0,0 +1,2 @@
+<app-navigation></app-navigation>
+<p>tweets works!</p>

frontend/src/app/component/tweets/tweets.component.ts

@@ -0,0 +1,15 @@
+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-tweets',
+  templateUrl: './tweets.component.html',
+  styleUrls: ['./tweets.component.css']
+})
+export class TweetsComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}