add `README.md` to interfaces #433

Job	Run time
build_linux (3.9)	2m 42s
build_windows (3.9)	9m 2s
build_linux (3.10)	2m 36s
build_windows (3.10)	24m 17s
build_linux (3.11)	2m 40s
build_windows (3.11)	9m 28s
build_linux (3.12)	2m 42s
build_windows (3.12)	17m 14s
test_linux (3.9, false, ubuntu-latest)	1m 49s
test_linux (3.10, false, ubuntu-latest)	1m 48s
test_linux (3.11, false, ubuntu-latest)	1m 35s
test_linux (3.12, false, ubuntu-latest)	1m 33s
test_windows (3.9, false, windows-2019)	3m 37s
test_windows (3.10, false, windows-2019)	3m 38s
test_windows (3.11, false, windows-2019)	4m 6s
test_windows (3.12, false, windows-2019)	3m 35s
	1h 32m 22s

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