ELOBackend

This will be service for managing game statistics and match making

Objectives

Rest API for communication with the game server

First versions will contain only basic service without user authentication. In the current basic form api should implement following endpoints:

GET     /user/:userId -> UUID as String     | returns User
POST    /user/:userLogin -> String          | returns Ok
TBD(match API)

Ranking calculation

Every time the game will be finished the user rating should be updated. Rating will be based on the Elo rating system(https://en.wikipedia.org/wiki/Elo_rating_system).