Lobby and Rendezvous Server

[Indy2222]

• Make the first version very simple:
  • Sign-in & sign-up
    • The initial version has some very dummy user management
    • After sign-in, you receive a JWT used for every other request
  • Create new game (name, map, maximum players)
  • List games
  • Join game
  • Leave game
    • Game is deleted if it is abandoned by its author
  • Start game (leads to game deletion)
• The server exposes REST API
• Base the server on Actix
• Publish Open API specification
• Build & publish API docs from CI