Implement Add platform details endpoint (Admin) #37

Purpose

The purpose of this PR is to fix #37

Goals

This issue involves implementing an API to Add platform details. The endpoint should allow Admin to make a POST request to {{baseUrl}}/api/admin/platform.

Approach

    const platformRepository = dataSource.getRepository(Platform)

    const newPlatform = new Platform(
      description,
      mentor_questions,
      image_url,
      landing_page_url,
      email_templates,
      title
    )

    const savedPlatform = await platformRepository.save(newPlatform)

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

sef-global / scholarx-backend

Implement Add platform details endpoint (Admin) #37 #74