Instructor js implementation

[mayurvir]

Description

This PR will add an API to create categories.

Features covered

<Put the link of your Jira task. Should be ideally 1 but if in case there are more than one, you should add all of them.>

• https://jira.com/foo/bar

Changes made

* Added a new controller for categories * Added aws-s3 library for downloading images * Added test cases for apis * Updated API documentation * spelling correction in the helper function

Screenshots/recordings

<If possible, create a screen recording or add screenshots of changes you have made. This will allow the reviewer to test the pr quickly and not miss anything due to assumptions>

Testing

Self checks

• Code follows coding style guidelines.
• All tests pass successfully.
• No new linting errors or warnings.
• Documentation is updated, if necessary.
• Dependencies are updated, if required.
• There are no merge conflicts.

Reviewer Suggestions

<Any suggestions that you want the reviewer to look at such as special instructions, any files that you want them to specially check.>