Add User feature

[amaurymedeiros]

Add a projects field to User model. A list of Project

User model should contain the following fields:

• username (required)
• password (required)
• name (required)

User controller should include the following methods:

• create (ADMIN only)
• update (ADMIN only. Regular users can update their name and password only.)
• delete (ADMIN only)
• list
• show

Suggested tests:

• Create user using an ADMIN user (should return 201 - Created)
• Create user using a user from any other level (should return 401 - Unauthorized)
• Update user using an ADMIN user (should return 200 - OK)
• Update user using a user from any other level (should return 401 - Unauthorized)
• Regular user update other user (should return 401 - Unauthorized)
• Regular user update their name/password (should return 200 - OK)
• Regular user update other field but name/password (should return 401 - Unauthorized)
• Delete user using an ADMIN user (should return 200 - OK)
• Delete user using a user from any other level (should return 401 - Unauthorized)
• List all user using an ADMIN user (should return 200 - OK)
• List all user using a user from any other level (should return 200 - OK)
• View a user using an ADMIN user (should return 200 - OK)
• View a user using a user from any other level (should return 200 - OK)
• Create/Update user without required fields