Creating a restful web service for User Management application using Spark Java and Mongodb.

-> Developed below 3 services using Spark Java and MongoDB 1)createUser - . Takes input as JSON. . Creates the user if he is not already available in the data store. . if user already exists, send back a 404 response saying user already exists.

2. getAllUsers - . Gives the list of all users that are in the data store.

3. updateUser - . Takes input as JSON. . Finds the user from the data store. . if found, updates the required fields. If not found, send back a 404 response saying user not found.

-- Implemented JUnit test cases to test the services.

1. Run Main.java to launch the application.
2. Use a rest client(Postman) to send requests(POST, GET, PUT)
   OR Test your web services using UserManagementControllerTest.java (Junit test cases).