Documentation - Add Contribution guidelines #43

Job	Run time
Prepare and Build on macOS with GCC (x64)	10m 25s
Prepare and Build on Ubuntu with GCC (x64)	23m 7s
Prepare and Build on Ubuntu with Clang (x64)	16m 55s
Prepare and Build on macOS with Clang (x64)	9m 59s
Prepare and Build on Windows with Clang (x64)	21m 35s
Prepare and Build on Windows with MSVC (x64)	14m 11s
Test on macOS (x64)	46m 0s
Test on macOS with GCC (x64)	53m 23s
Test on Windows (x64)	1h 12m 38s
Test on Linux with Clang (x64)	32m 22s
Test on Windows with Clang (x64)	1h 11m 34s
Test on Linux with GCC (x64)	32m 42s
Summarize and Send PR Message	17m 52s
	7h 2m 43s

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