Add base documentation for evp_test tool #62

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings no-fips)	36m 38s
minimal (windows-2019)	12m 12s
minimal (windows-2022)	13m 17s
plain (windows-2019)	30m 10s
plain (windows-2022)	24m 55s
shared (windows-2019, win64, enable-fips)	38m 0s
shared (windows-2019, win32, --strict-warnings no-fips)	52m 34s
shared (windows-2022, win64, enable-fips)	38m 50s
shared (windows-2022, win32, --strict-warnings no-fips)	48m 47s
	4h 55m 23s

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