Added queue class
add user at server
deny user to enqueue when he in queue

Signed-off-by: Artsiom Marozau <Artsiom_Marozau@epam.com>
Add Queue
Merge branch 'devrlop_clientapp' of https://github.com/FrozzyBoy/nishtyachki.git into ManagaUserAccounts_branch
added queue functionality