Add public repository guidance and copyright headers (#4) #32

Job	Run time
linux (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 19s
sdist	16s
macos (x86_64-apple-darwin)	4m 28s
macos (aarch64-apple-darwin)	4m 41s
linux (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	5m 1s
windows (x86_64-pc-windows-msvc)	10m 47s
Smoke (local) windows-latest py3.12	45s
Smoke (registry) ${{ matrix.os }} py${{ matrix.python }}	0s
Publish to PyPI	0s
Report registry smoke failure	0s
	31m 17s

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