-- pom.xml sl4j.jar is added because of junit requirement.

-- HomeController.java new save,update and delete user is defined.

-- UserModel.java _id field name is changed to id.

-- UserService.java new save,update and delete user is defined.

-- UserServiceImpl.java new save,update and delete user is defined.

-- userJTable.js new save,update and delete user is defined.

-- JsonJtableUserModelResponse object is defined to provide the
integration with jTable and Controller class over json object at CRUD
operation.

-- UserServiceImplTest.java is created for unit testing, actually it is
not working now.