User module | Register Feature

### Attributes
- [ ] name
- [ ] email
- [ ] password
- [ ] phone no

### Validation
- [ ] validateUser()
- [ ] validateEmail()
- [ ] validatePassword()
- [ ] validateName()

### Validation Tests:
- [ ] testvalidateUser()
- [ ] testvalidateEmail()
- [ ] testvalidatePassword()
- [ ] testvalidateName()

###DAO:

- [ ] createUser()

###Service:

- [ ] registerUser()

### Service Tests:
TestRegisterFeature

- [ ] testRegisterSuccess()

###Estimation:
- [ ] 10 hrs

#Turbo Trip
[Milestones](https://github.com/fssa-batch3/sec_a_gowtham.sathyamoorthy__corejava_project_2/milestones)

###ERDIAGRAM
[](https://freeimage.host/i/HpQ4rMu)
### Flow:
```mermaid
flowchart TD
A[Start]
B[Display Registration Form]
C[User Fills out Form]
D[Validate Input]
E{Validation Successful?}
F[Save User Data]
G[Registration Successful]
H[Display Error Messages]
I[End]
A --> B
B --> C
C --> D
D --> E
E -- Yes --> F
F --> G
E -- No --> H
H --> B
H --> I
G --> I
```

Start with the ER diagram and the registration flow, then trace the planned validateUser(), validateEmail(), validatePassword(), validateName(), createUser(), and registerUser() entry points in the project. Done means registration stores name, email, password, and phone data, validates the listed fields, and includes the specified validation and TestRegisterFeature tests for successful registration.

Written by the indexing model from the issue text.