todos.txt

For now
    Sound for pieces, checks etc
    Notification when another player joins and disconnects
    Logo CheSS

Unit testing
    Really need some form of unit testing - maybe JEST

Local play
    Enable saving of game state

Chess edge cases
    Pawn promotions
    En passant
    Castling

Bugs
    Major - The server begins to break for more than 2 players
           When joining a room if there is at least a 3rd player on the server then moves can no longer be made.
    Medium - ghost pieces can't be moved through in some cases (e.g. queen can't move through)
    ...

Back end
    Logging for when users join, leave etc
    Spam prevention
    Empty rooms need to be cleared up (Heroku seems to do this)
    People need to be disconnected from rooms after leaving for too long
    Figure out how to import all the web socket code into dev-server.js

Remaining aesthetic stuff
    ...
    Splash screen
    Logger font colours (e.g. errors, good messages, neutral messages)
    Logger sounds