Issue #57- Endpoint to get all participating dental colleges

[SatabrataPaul-GitAc]

Description

Added Endpoint to get all participating dental colleges Built helper tp get all participating dental colleges

Issue Ticket Number

Fixes #57

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Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] This change requires a documentation update

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Checklist:

• [X] I have followed the contributing guidelines of this project as mentioned in CONTRIBUTING.md
• [X] I have checked to ensure there aren't other open Pull Requests for the same update/change?
• [X] I have performed a self-review of my own code

[nikhil25803]

@SatabrataPaul-GitAc

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