Basic setup for backend

[sabit990928]

Link for the ticket: https://www.notion.so/Basic-setup-for-backend-7cfc7b0b48f2451abecb76eeb972e380

What

Generated app by mix phx.new backend_no_html_assets_mailer_dashboard --no-html --no-assets --no-mailer --no-dashboard command. --no-smth means that you won't generate that stuff.

You can read more in docs: https://hexdocs.pm/phoenix/Mix.Tasks.Phx.New.html

How to start sever locally (no docker container for now)

• install elixir locally https://elixir-lang.org/install.html#macos
• run cd backend
• run mix ecto.create to create local db
• run iex -S mix phx.server
• make sure there's no issues

[sabit990928]

cc @baigazini @alisher-aituarov