docs: document CP2K interface #4551

Job	Run time
Build source distribution	23s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 6s
Build wheels for cp311-manylinux_x86_64	5m 7s
Build wheels for cp311-macosx_x86_64	12m 17s
Build wheels for cp311-macosx_arm64	4m 41s
Build wheels for cp311-win_amd64	7m 19s
Build wheels for cp310-manylinux_aarch64	4m 26s
build_docker (12)	4m 36s
build_docker (_cu11, 11)	2m 52s
build_pypi_index	11s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	4s
	47m 3s

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