Resolve "login screen - project setup"

Closes #21 (closed)

Proposed changes

• Generated app via angular cli
• Imported angular material and all of its dependencies
• Created custom theme for angular material

e2e/app.e2e-spec.ts

+import { AppPage } from './app.po';
+
+describe('arsnova-angular-frontend App', () => {
+  let page: AppPage;
+
+  beforeEach(() => {
+    page = new AppPage();
+  });
+
+  it('should display welcome message', () => {
+    page.navigateTo();
+    expect(page.getParagraphText()).toEqual('Welcome to app!');
+  });
+});