[Mega-Feat]: [Create CRUD, full endpoint for Coursework, add APIdocs, and also add testcases]

[kskarthik05]

1. Create all endpoints for Coursework

Make a file in routes folder with the name coursework.js
make a URL as coursework/create, coursework/list, coursework/update, coursework/delete
then make the required files and functions in services and controller folder.

2. Create all testcases for Coursework

add testcases for all endpoints of coursework, inside coursework.test.js inside of test/routes

3. Create APIDOCs for Coursework

make api doc in _apidoc.js for all requests in the route for Coursework