Add mention of ruleset templates to readme
Add mention of ruleset templates to readme

ppy/osu,UselessToucan/osu,NeoAdonis/osu,ppy/osu,smoogipoo/osu,smoogipoo/osu,NeoAdonis/osu,peppy/osu,peppy/osu,ppy/osu,peppy/osu-new,NeoAdonis/osu,smoogipooo/osu,UselessToucan/osu,peppy/osu,UselessToucan/osu,smoogipoo/osu