Post, category controllers and tests

[halimyusuf]

Description

• 1481184 chore: implement all post middleware
• ab24ea5 chore: implement all category controllers
• 82f4d47 chore: add auth and admin auth middlewares to routes
• f9daf78 test: category controller tests
• 51efddc test: post tests

List any dependencies that are required for this change.
.env file must contain:

• PORT=port-num
• DB_URL=mongodb url
• jwtPrivateKey=jwt secret
• NODE_ENV=test

NB: NODE_ENV must be equal to test for npm test to work

How Has This Been Tested?

npm test

Checklist:

• [ x] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• [x ] I have added necessary inline code documentation
• [ x] I have added tests that prove my fix is effective and that this feature works
• [x ] New and existing unit tests pass locally with my changes