Move ShowUsersCommand to OpenCBS.Service.
Add ShowUsersCommandTest.
Move ShowRolesCommand to OpenCBS.Service.
Add ShowRolesCommandTest.
Move ShowLoanProductsCommand to OpenCBS.Service.
Add ShowLoanProductsCommandTest.
Move ShowEntryFeesCommand to OpenCBS.Service.
Add ShowEntryFeesCommandTest.
Move ShowCurrenciesCommand to OpenCBS.Service.
Add ShowCurrenciesCommandTest.
Move AddUserCommand to OpenCBS.Service.
Add AddUserCommandTest.