Add Feedback feature

[amaurymedeiros]

Add a feedbacks field to User model. A list of Feedback

Feedback model should contain the following fields:

• author (required) - The user who gives the feedback
• feedback (required) - The feedback itself
• recipient (required) - The user that receives the feedback

Feedback controller should include the following methods:

• create (ADMIN only)
• update (ADMIN only)
• delete (Only ADMIN that created the feedback.)
• list
• show

Suggested tests:

• Create feedback using an ADMIN user (should return 201 - Created)
• Create feedback using a user from any other level (should return 401 - Unauthorized)
• Update feedback using an ADMIN user (should return 200 - OK)
• Update feedback using a user from any other level (should return 401 - Unauthorized)
• Delete feedback using an ADMIN that created the feedback (should return 200 - OK)
• Delete feedback using other ADMIN (should return 401 - Unauthorized)
• Delete feedback using a user from any other level (should return 401 - Unauthorized)
• List all feedback using an ADMIN user (should return 200 - OK)
• List all feedback using a user from any other level (should return 200 - OK)
• View a feedback using an ADMIN user (should return 200 - OK)
• View a feedback using a user from any other level (should return 200 - OK)
• Create/Update feedback without required fields