add player rating to the db

main-server/config/initializers/matchmaking.rb

@@ -2,7 +2,8 @@
 mm = Rails.application.config.x.matchmaking = ActiveSupport::OrderedOptions.new
 
 mm.game_server_url  = ENV.fetch("GAME_SERVER_URL", "ws://localhost:8080")
-mm.default_rating   = ENV.fetch("MATCHMAKING_DEFAULT_RATING", 1000).to_i
+# Players' initial rating lives in the DB (users.rating, default 100),
+# so no default rating is configured here.
 
 # How long a found match (and its game token) stays valid, in seconds.
 mm.match_ttl        = ENV.fetch("MATCHMAKING_MATCH_TTL", 120).to_i