Added UserServicesAsync class in order to separate the code into synchronous and asynchronous methods
Removed unneeded methods.
Added method of UserServicesAsync
Implementation return to UserRandomAsync in RandomUser class
Added class Gender to contains gender constants.
Implementation gender constants
Removed unnecessary constants.
clean code.
Changed class changes RandomUser
Merge branch 'feature/Change_userservices' into develop
Added UserServicesAsyncTest class.
removed methods and implementation methods of Async
Implementation initial test.
Implementation test for the class UserServicesTest
Implementation test for the UserServicesAsyncTest class.
Added method userWithSeed for getting a specified random user.
Merge branch 'feature/test' into develop
Added test for method userWithSeed()
Added method userWithSeedAsync
Added test for the method userWithSeedAsync()