Add Project feature

[amaurymedeiros]

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

Project model should contain the following fields:

• name (required)
• users (required)
• description (optional)

Project controller should include the following methods:

• create (ADMIN only)
• update (ADMIN only)
• delete (ADMIN only)
• list (ADMIN only. Regular users can list projects which they are member of)
• show (ADMIN only. Regular users can view projects which they are member of)

Suggested tests:

• Create project using an ADMIN user (should return 201 - Created)
• Create project using a user from any other level (should return 401 - Unauthorized)
• Update project using an ADMIN user (should return 200 - OK)
• Update project using a user from any other level (should return 401 - Unauthorized)
• Delete project using an ADMIN user (should return 200 - OK)
• Delete project using a user from any other level (should return 401 - Unauthorized)
• List all projects using an ADMIN user (should return 200 - OK)
• List all projects using a user from any other level (should return 200 - OK. all the projects listed should have the user as member)
• View a project using an ADMIN user (should return 200 - OK)
• View a project using a user from any other level (should return "200 - OK" if the user is a member of the project, otherwise 401 - Unauthorized)
• Create/Update project without required fields