Run Github CI tests.

Create README for the PYTHON directory #615

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Run time

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Job	Run time
Build and test (gcc, 1)	1m 10s
Build and test (gcc, 2)	1m 5s
Build and test (gcc, 3)	6m 8s
Build and test (gcc, 4)	6m 23s
Build and test (gcc, 5)	1m 10s
Build and test (gcc, 6)	1m 9s
Build and test (gcc, 7)	8m 16s
Build and test (gcc, 8)	8m 32s
Build and test (gcc, 9)	2m 35s
Build and test (gcc, 10)	4m 16s
Build and test (gcc, 11)	4m 16s
Build and test (gcc, 12)	1m 19s
Build and test (gcc, 13)	1m 28s
Build and test (gcc, 14)	1m 44s
Build and test (gcc, 15)	2m 33s
	52m 4s