Rewrite phase 1.

Started improved client code structure.

Implemented session based authentication serverside.

Implemented user, match, and sport database models serverside.

Implemented Controllers for variety of C and R operations of CRUD.

sports-matcher/client/src/App.test.js

@@ -0,0 +1,8 @@
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});