Updated the contribution guidelines
Updated the contribution guidelines

tekjava/CMS,Denniskevin/CMS-1,jfbcb/CMS,DreadPirateJay/CMS,miharbi/CMS,kungyu/CMS,jew977/CMS,markwu/CMS,Denniskevin/CMS-1,gcnonato/CMS,ho-dieu-it/CMS,mubassirhayat/CMS,jfbcb/CMS,XGTeam/HoumaChuangYeDaSai,beysong/CMS,luckys/CMS-1,plattinum09/CMS_SENTRY,pengwenbin7/CMS,jew977/CMS,XGTeam/HoumaChuangYeDaSai,matheusgomes17/CMS,markwu/CMS,tekjava/CMS,beysong/CMS,WangTe/CMS,Razorsheep/kleinesonne,mubassirhayat/CMS,rinodung/CMS,theroad/CMS,BootstrapCMS/CMS,mobileliker/CMS,freemanCD/reader-bootstrap-cms,plattinum09/CMS_SENTRY,WangTe/CMS,usapla1/CMS,radision/CMS,Bhavinshah5111/CMS,relizont/CMS,irawannubi/CMS,theroad/CMS,pengwenbin7/CMS,matrixchan/CMS,kungyu/CMS,miharbi/CMS,Razorsheep/kleinesonne,relizont/CMS,DreadPirateJay/CMS,usapla1/CMS,BootstrapCMS/CMS,Haafiz/CMS,rudolphp/CMS-1,muyangren/CMS,delphinBlue/CMS,mobileliker/CMS,xxlv/CMS,XGTeam/HoumaChuangYeDaSai,muyangren/CMS,Razorsheep/kleinesonne,jeremykenedy/CMS-1,chkir/CMS,ho-dieu-it/CMS,dnacreative/CMS-1,irawannubi/CMS,Haafiz/CMS,dnacreative/CMS-1,jeremykenedy/CMS-1,chkir/CMS,zacchen/CMS,freemanCD/reader-bootstrap-cms,radision/CMS,delphinBlue/CMS,zacchen/CMS,gcnonato/CMS,rudolphp/CMS-1,rinodung/CMS,Bhavinshah5111/CMS,matheusgomes17/CMS,xxlv/CMS,luckys/CMS-1,matrixchan/CMS