Top5 / SimpleClan support / colors / config file

Top5: running "/top5" will return the top 5 players and their rating

SimpleClan: running "/rating CLANTAG" will return an average of all
players in that clan

Colors: ratings below 350 show as red, above 650 are green, middle is
yellow.

Config: plugin creates a config file with defaults. Changing these will
change how ratings are calculated.