* cretaed the SaveUsers api to save the user details into database from the given data
* cretaed the EditUsers api to edit the user details inside the database by the unique google id
* cretaed the GetUsersByUniqueGoogleId api to fetch the user details by passing the unique google id 
* modified the saveuser api to return all the data with the success message
*created a master for the magazine category and the add,edit and delete functions done and added the menu to the sidebar.