add user login

[Aajibolah]

User Story Description

As an Admin/employee,
I need a login page,
So I can sign in.

Steps to Follow (optional)

• Enter Email
• Enter Password
• Additional steps as necessary

Acceptance criteria

• Frontend
• A login page should be created
• Admin should be able to sign in with email and password
• The credentials for signing in should be valid
• Backend
• A login endpoint should be created - POST /auth/signin
• The endpoint should accept email and password
• A database should be created - chore

Additional Considerations

Any supplemental information including unresolved questions links to external resources, screenshots, etc.

TASKS

• Add user login endpoint (Backend) - Add user login endpoint #40
• Add user login template (Frontend) - Add user login template #41
• Add jwt - Add token based authentication using jwt #42