add `README.md` to interfaces #422

Job	Run time
build_linux (3.9)	2m 49s
build_linux (3.10)	2m 53s
build_linux (3.11)	2m 36s
build_windows (3.9)	13m 26s
build_linux (3.12)	2m 55s
build_windows (3.10)	20m 1s
build_windows (3.11)	13m 28s
build_windows (3.12)	13m 7s
test_linux (3.9, false, ubuntu-latest)	1m 57s
test_linux (3.10, false, ubuntu-latest)	1m 29s
test_linux (3.11, false, ubuntu-latest)	1m 24s
test_linux (3.12, false, ubuntu-latest)	1m 46s
test_windows (3.9, false, windows-2019)	3m 31s
test_windows (3.10, false, windows-2019)	3m 40s
test_windows (3.11, false, windows-2019)	4m 6s
test_windows (3.12, false, windows-2019)	3m 53s
	1h 33m 1s

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