Implement Get mentor categories endpoint (Public endpoint)

[sathudeva7]

Purpose

The purpose of this PR is to fix #16

Goals

This issue involves implementing an API to get mentor categories. The endpoint should allow clients to make a GET request to {{baseUrl}}/api/categories.

Approach

Created new route folder for categories. /src/routes/category/category.route.ts

Screenshots

Checklist

• [x] This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• [x] I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• [ ] 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

• [] I have made corresponding changes to the documentation

Related PRs

## Test environment ## Learning