Added CONTRIBUTING.md file with guidelines for external contributors
Added CONTRIBUTING.md file with guidelines for external contributors

IanLewis/dashboard,danielromlein/dashboard,kubernetes/dashboard,lenartj/dashboard,cnwalker/dashboard,bryk/dashboard,digitalfishpond/dashboard,cheld/dashboard,bryk/dashboard,lenartj/dashboard,batikanu/dashboard,digitalfishpond/dashboard,rf232/dashboard,IanLewis/dashboard,SebastianM/dashboard,luxas/dashboard,zreigz/dashboard,f-higashi/dashboard,floreks/dashboard,zreigz/dashboard,ammeon/dashboard,kenan435/dashboard,edouardKaiser/dashboard,titilambert/dashboard,f-higashi/dashboard,amitbitcse/dashboard,titilambert/dashboard,digitalfishpond/dashboard,edouardKaiser/dashboard,vin/dashboard,kenan435/dashboard,kubernetes/dashboard,ammeon/dashboard,vlal/dashboard,ammeon/dashboard,vlal/dashboard,amitbitcse/dashboard,bryk/dashboard,luxas/dashboard,SebastianM/dashboard,taimir/dashboard,vin/dashboard,lenartj/dashboard,taimir/dashboard,rf232/dashboard,SebastianM/dashboard,IanLewis/dashboard,f-higashi/dashboard,tangfeixiong/dashboard,cnwalker/dashboard,amitbitcse/dashboard,edouardKaiser/dashboard,danielromlein/dashboard,zreigz/dashboard,vlal/dashboard,kenan435/dashboard,bryk/dashboard,floreks/dashboard,floreks/dashboard,zreigz/dashboard,cnwalker/dashboard,rf232/dashboard,danielromlein/dashboard,ammeon/dashboard,tangfeixiong/dashboard,floreks/dashboard,taimir/dashboard,kubernetes/dashboard,kubernetes/dashboard,vin/dashboard,IanLewis/dashboard,edouardKaiser/dashboard,cheld/dashboard,titilambert/dashboard,digitalfishpond/dashboard,taimir/dashboard,vin/dashboard,titilambert/dashboard,danielromlein/dashboard,kubernetes/dashboard,tangfeixiong/dashboard,lenartj/dashboard,amitbitcse/dashboard,kenan435/dashboard,cheld/dashboard,batikanu/dashboard,batikanu/dashboard,rf232/dashboard,cheld/dashboard,f-higashi/dashboard,cnwalker/dashboard,vlal/dashboard,luxas/dashboard,batikanu/dashboard,luxas/dashboard,tangfeixiong/dashboard,floreks/dashboard