BETTERZON-29: Adding test component

Frontend/src/app/app.module.ts

@@ -2,10 +2,12 @@ import { BrowserModule } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
 
 import { AppComponent } from './app.component';
+import { HelloWorldComponent } from './hello-world/hello-world.component';
 
 @NgModule({
   declarations: [
-    AppComponent
+    AppComponent,
+    HelloWorldComponent
   ],
   imports: [
     BrowserModule