[0.0.2] Adds Google and Github OAuth2 Login

Implements integration with the Backend API feature of OAuth2 Login with Google and Github.

src/app/header/header-popup/callback/callback.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { CallbackComponent } from './callback.component';
+
+describe('CallbackComponent', () => {
+  let component: CallbackComponent;
+  let fixture: ComponentFixture<CallbackComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ CallbackComponent ]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(CallbackComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});