Implemented login functionality, auth services, added lots of components by intention to use in future for further components, started little development for admin.
Login functionality is not complete because doctor and patient API are not written and for admin is currently verified by role and username only. Will be imported in coming weeks.
Some components and libraries can be removed at the end if not used till submission or can keep for future enhancement.
Can check UI by executing 'ng serve' in client directory.