docs(CONTRIBUTING): add tips
docs(CONTRIBUTING): add tips

mabdelfattah/activeadmin_addons,mabdelfattah/activeadmin_addons,platanus/activeadmin_addons,platanus/activeadmin_addons,platanus/activeadmin_addons,platanus/activeadmin_addons,mabdelfattah/activeadmin_addons,mabdelfattah/activeadmin_addons