add `README.md` to interfaces #434

Job	Run time
build_windows (3.9)	17m 48s
build_linux (3.9)	2m 34s
build_windows (3.10)	19m 32s
build_linux (3.10)	2m 36s
build_linux (3.11)	2m 20s
build_windows (3.11)	20m 0s
build_linux (3.12)	2m 28s
build_windows (3.12)	17m 47s
test_linux (3.9, false, ubuntu-latest)	1m 34s
test_linux (3.10, false, ubuntu-latest)	1m 22s
test_linux (3.11, false, ubuntu-latest)	1m 36s
test_linux (3.12, false, ubuntu-latest)	1m 29s
test_windows (3.9, false, windows-2019)	3m 2s
test_windows (3.10, false, windows-2019)	4m 4s
test_windows (3.11, false, windows-2019)	3m 51s
test_windows (3.12, false, windows-2019)	2m 56s
	1h 44m 59s

Provide feedback