Add support for [Elo ratings](https://en.wikipedia.org/wiki/Elo_rating_system) - [x] Add Elo rating field to Squads - [x] Add mission result table - [ ] Add UI to record mission results - [ ] Update squad ratings - [ ] UI to submit mission result - [ ] UI to confirm mission result - [ ] Add stats component to view Elo per Squad - [ ] Add stats component to view average (median?) Elo per User - [ ] Add stats component to view average (median?) Elo per Faction
Add support for Elo ratings