add backend from https://gitlab.com/RafifEL/temp_phoenix_funpro

diskuy_back/.formatter.exs

diskuy_back/.gitignore

diskuy_back/README.md

diskuy_back/config/config.exs

diskuy_back/config/dev.exs

diskuy_back/config/prod.exs

diskuy_back/config/prod.secret.exs

diskuy_back/config/test.exs

diskuy_back/lib/diskuy.ex

diskuy_back/lib/diskuy/account.ex

diskuy_back/lib/diskuy/account/user.ex

diskuy_back/lib/diskuy/application.ex

diskuy_back/lib/diskuy/forum.ex

diskuy_back/lib/diskuy/forum/post.ex

diskuy_back/lib/diskuy/forum/thread.ex

diskuy_back/lib/diskuy/forum/topic.ex

diskuy_back/lib/diskuy/repo.ex

diskuy_back/lib/diskuy_web.ex

diskuy_back/lib/diskuy_web/channels/user_socket.ex

...uy_back/lib/diskuy_web/controllers/fallback_controller.ex