added documentation
added documentation

KnpLabs/php-github-api,martinssipenko/php-github-api,lucasmichot/php-github-api,guillermoandrae/php-github-api,SakyaStelios/php-github-api,dominionenterprises/php-github-api,daconex/php-github-api,acrobat/php-github-api,nidup/php-github-api,aaronbloomfield/github-api-tools,Soullivaneuh/php-github-api