Create category

### User story :

Category created and successfully category details stored in database.

### Pre-requisites:- [ ] category DAO(create category)

- [ ] category table
- [ ] category model
- [ ] category DAO
- [ ] category service ( create )

#### Validations:

- [ ] Form Validation
* category null
* name ( null, empty, pattern )

- [ ] Business Validation
* Category name Already exists

#### Messages:

* Category object cannot be null
* Name cannot be null or empty
* Name should be match with the given pattern
* Category already exists

#### Flow:

> Invalid When a category's name is already in use or when the input provided does not meet the criteria, categories arise.

```mermaid
graph TD;

A(CategoryService - Category Object) --> B(Form Validation) -- Valid --> C(Business Validation)
B -- Invalid --> G(Validation Exception)
C -- Valid --> D(Argument Passed to CategoryDAO)
D --> E(Store Value in Database)
C -- Invalid --> F(Validation Exception)
```