Number of APIs: 5
1. getUsers
GET http://localhost:3000/api/users/
2. getUser
GET http://localhost:3000/api/users/1
3. deleteUser
DELETE http://localhost:3000/api/users/1
4. addUser
POST http://localhost:3000/api/users/
5. updateUser
PUT http://localhost:3000/api/users/1