Add OpenAPI Spec - To Cover the Context Boundry

[VinodhThiagarajan1309]

• Develop an Open API Spec to initialize a contract for future UI development
• It will be good to document all the available services and Domain Model

I have given a start here https://app.swaggerhub.com/apis-docs/VinodhThiagarajan1309/hostel-pass-management/0.0.1

Let me know if you want to develop further - @NishkarshRaj

[NishkarshRaj]

@VinodhThiagarajan1309 I would definitely look into this and revert.