Add `CODE_OF_CONDUCT.md` in line with SciTools template (#361) #565

Job	Run time
build macos-latest (x86_64) wheels	2m 18s
build windows-latest (AMD64) wheels	3m 45s
Build sdist	12s
build macos-latest (arm64) wheels	1m 3s
build ubuntu-latest (x86_64) wheels	8m 11s
Show artifacts	4s
Publish to Test PyPI	32s
Publish to PyPI	-1s
	16m 4s

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