added youtube search functionality in frontend

src/app/youtube-search.service.spec.ts

@@ -0,0 +1,12 @@
+import { TestBed } from '@angular/core/testing';
+
+import { YoutubeSearchService } from './youtube-search.service';
+
+describe('YoutubeSearchService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: YoutubeSearchService = TestBed.get(YoutubeSearchService);
+    expect(service).toBeTruthy();
+  });
+});