Initial implementation of login and registration with fake backend for future testing

Also introduced flex-layout

src/app/account/register/password-error-state-matcher.spec.ts

@@ -0,0 +1,7 @@
+import { PasswordErrorStateMatcher } from './password-error-state-matcher';
+
+describe('PasswordErrorStateMatcher', () => {
+  it('should create an instance', () => {
+    expect(new PasswordErrorStateMatcher()).toBeTruthy();
+  });
+});