Create CONTRIBUTING.md #99

Job	Run time
queries (cpp)	3s
extensions (csharp)	3s
queries (csharp)	6s
library_sources_extensions (csharp)	7s
extensions (java)	4s
queries (go)	3s
library (cpp)	8s
library_sources_extensions (java)	5s
queries (java)	7s
library (csharp)	6s
queries (javascript)	2s
library (go)	3s
queries (python)	2s
library (java)	4s
queries (ruby)	2s
library (javascript)	3s
library (python)	3s
library (ruby)	6s
	1m 17s

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