Added a temporary implementation of ILoginProvider called LoginProvider.

Created a LoginViewModel that holds the Username, Password, and whether or not the "Invalid username or password." text should be visible.

Created a temporary implementation of IMainPresenter called MainPresenter.

Created a DataBindingSource for LoginView and databound each gui component.

LoginPresenter now subscribes to LoginView's events.

Created tests over LoginPresenter.Load()

Gave LoginView a Create button and corresponding event for creating new accounts.

IMainPresenter's Load will take the IAccount that ILoginPresenter will get.