add CONTRIBUTING.md
add CONTRIBUTING.md

et304383/passbolt_api,HavokInspiration/cakephp,gmponos/cakephp,nrother/cakephp,thinkingmedia/cakephp,web-player/cakephp,garethellis36/cakephp,tisu2tisu/cakephp,ndm2/cakephp,erikfig/cakephp,mvdriel/cakephp,Balachan27/cakephp,dkarvounaris/cakephp,et304383/passbolt_api,mvdriel/cakephp,Balachan27/cakephp,jerems02/cakephp,ADmad/cakephp,Phillaf/cakephp,erikfig/cakephp,davidyell/cakephp,dkarvounaris/cakephp,cakephp-fr/cakephp,cakephp-fr/cakephp,ndm2/cakephp,tenkoma/cakephp,adopico/cakephp,kumamidori/cakephp,erikfig/cakephp,nrother/cakephp,HavokInspiration/cakephp,davidyell/cakephp,pbaire/cakephp,justinyost/cakephp,elboletaire/cakephp,pbaire/cakephp,dakota/cakephp,akintoey/cakephp,kumamidori/cakephp,tgr0ss/cakephp,jerems02/cakephp,timhoeppner/cakephp,CVO-Technologies/cakephp,davidyell/cakephp,timhoeppner/cakephp,burriko/cakephp,dkarvounaris/cakephp,jjj117/cakephp,Phillaf/cakephp,garethellis36/cakephp,burriko/cakephp,CakeDC/cakephp,petteyg/cakephp,ionas/cakephp,berrygoudswaard/cakephp,tenkoma/cakephp,dakota/cakephp,pbaire/cakephp,garethellis36/cakephp,adopico/cakephp,tenkoma/cakephp,jeffblack360/cakephp,et304383/passbolt_api,jeffblack360/cakephp,cakephp/cakephp,thinkingmedia/cakephp,Phillaf/cakephp,kumamidori/cakephp,yinhe007/cakephp,justinyost/cakephp,ADmad/cakephp,justinyost/cakephp,cakephp/cakephp,tenkoma/cakephp,jeffblack360/cakephp,berrygoudswaard/cakephp,garethellis36/cakephp,adopico/cakephp,tgr0ss/cakephp,ionas/cakephp,dakota/cakephp,michaelze/cakephp,tgr0ss/cakephp,HavokInspiration/cakephp,ADmad/cakephp,elboletaire/cakephp,tisu2tisu/cakephp,petteyg/cakephp,Balachan27/cakephp,jerems02/cakephp,berrygoudswaard/cakephp,mvdriel/cakephp,khoimt/cakephp-study,eryw/cakephp,yinhe007/cakephp,dakota/cakephp,mvdriel/cakephp,cakephp/cakephp,cakephp/cakephp,CVO-Technologies/cakephp,ionas/cakephp,petteyg/cakephp,et304383/passbolt_api,ndm2/cakephp,CakeDC/cakephp,ndm2/cakephp,eboominathan/cakephp,jjj117/cakephp,khoimt/cakephp-study,nrother/cakephp,bravo-kernel/cakephp,et304383/passbolt_api,gmponos/cakephp,elboletaire/cakephp,cakephp-fr/cakephp,akintoey/cakephp,eryw/cakephp,gmponos/cakephp,web-player/cakephp,eboominathan/cakephp,akintoey/cakephp,eboominathan/cakephp,michaelze/cakephp,bravo-kernel/cakephp,CakeDC/cakephp,yinhe007/cakephp,jjj117/cakephp,timhoeppner/cakephp,web-player/cakephp,petteyg/cakephp,tisu2tisu/cakephp,eryw/cakephp,ADmad/cakephp,thinkingmedia/cakephp,michaelze/cakephp,burriko/cakephp,bravo-kernel/cakephp,khoimt/cakephp-study,CVO-Technologies/cakephp,CakeDC/cakephp