add info about Plugins repository to README
add info about Plugins repository to README

csusantha/candy,csusantha/candy,who/candy,who/candy,nimbl3/candy-chat-handlebars,who/candy,korobochkin/candy,cmnisal/candy,SweetFruit/Game,SweetFruit/Game,candy-chat/candy,SweetFruit/Game,candy-chat/candy,csusantha/candy,cmnisal/candy,cmnisal/candy,mojolingo/candy,korobochkin/candy,candy-chat/candy,amiadogroup/candy,bklang/candy