User Module | List User Feature

# User List Feature
## User Story
**User Story:**
As a admin i have to see how many users are using my application so this feature helps me to get the list of users

## Task
- [ ] Implementation of DAO Layer
- [ ] Implementation of a Service Layer
- [ ] Create JUnit TestCases
- [ ] Ensure Test Cases are passing
- [ ] Write comments for the methods used

## DAO

- [ ] getAllUser

## Service
- [ ] getUsers

## Validation
- [ ] admin Validation

## Junit Test Cases
### Dao
- [ ] getAllUserTest
### Service
- [ ] getUsersTest
### Validation
- [ ] admin Validation Test
## FlowChart
```mermaid
graph TD;
A[ Start ];
B[ adminId Validation]
C[ Login Validation]
D[ InValid Entry Exception]
E[getUsers ]
F[ List of Users ]
A --> B
B -->|Success|C
B -->|Fail|D
D -->H
C --> |success| E
C -->|Fail| I[Validation Exception]
E -->|success|F
E -->|Fail|G[Service Exception]
G --> H
F --> H[End]