Develop Add user Component

[vignesh-6145]

Issue to keep track of AddUser Component

Requirements

• [x] Create an Entity for User
• [ ] Create A Rest call that which can insert the new user into DB
• [ ] Failed constraints should be visible in the Response
• [ ] Role should be taken care by back-end user should not assign it
• [ ] DOJ should not be entered by user

[vignesh-6145]

Re-assigning the issue to me, as @bandla88 was busy with his schedule