Create User

### User story :

> User created successfully and the user details will be stored in database.

### Pre-requisites:
- [ ] user table
- [ ] user model
- [ ] user DAO (Create)
- [ ] user service ( create )

#### Validations:

- [ ] Form validator
* user ( null )
* Name ( null, empty, pattern )
* email ( null, empty, pattern )
* password ( null, empty, pattern )
- [ ] Business Validation
* Email Already exists

#### Messages:

* User object cannot be null
* Name cannot be null or empty
* Name should be match with the given pattern
* Email cannot be null or empty
* Email Should be match with the given pattern
* Password cannot be null or empty
* Password must contains at least 8 characters
* Password should be match with the given pattern
* User already exists

#### Flow:
> Invalid When a user's email is already in use or when the input provided does not meet the criteria, users arise.
```mermaid
graph TD;

A(UserService - Object user) --> B(Form Validation) -- Valid --> C(Business Validation)
B -- Invalid --> H(Validation Exception)
C -- Valid --> D(Argument Passed to UserDAO)
D --> F(Store Value in Database)
C -- Invalid --> G(Validation Exception)