Add contributing guide
Add contributing guide

evgenypoyarkov/bodybuilder,ShareIQ/bodybuilder,danpaz/bodybuilder,node-packages/bodybuilder,node-packages/bodybuilder,ShareIQ/bodybuilder,danpaz/bodybuilder,arielshad/bodybuilder,arielshad/bodybuilder,danpaz/bodybuilder,evgenypoyarkov/bodybuilder