Subscription Service

[cvsnraju]

Create a REST based API for subscription service with below features.

• Duplicate Validation / Existing user check
• Unsubscribe functionality
• Validation for email ( with pattern matching )

Supported CRUD functionalities of API

1. Create record which indirectly checks for existing of record match, with confirmation message.

• Create, Retrieve

2. Delete existing record with confirmation message to user.

• Delete