Create bug-labels.md
Create bug-labels.md

Added documentation around our bug triaging process and bug labels.
wardpeet/lighthouse,arturmiz/lighthouse,arturmiz/lighthouse,GoogleChrome/lighthouse,mixed/lighthouse,arturmiz/lighthouse,deepanjanroy/lighthouse,umaar/lighthouse,umaar/lighthouse,wardpeet/lighthouse,arturmiz/lighthouse,GoogleChrome/lighthouse,GoogleChrome/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,wardpeet/lighthouse,umaar/lighthouse,mixed/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse,deepanjanroy/lighthouse,tkadlec/lighthouse,wardpeet/lighthouse,ev1stensberg/lighthouse,tkadlec/lighthouse,umaar/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,tkadlec/lighthouse,tkadlec/lighthouse,ev1stensberg/lighthouse,mixed/lighthouse,arturmiz/lighthouse