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Add CLAUDE.md with development guidance #889

Job	Run time
Build & inspect our package.	17s
test (ubuntu-py310-pytestmain)	28s
test (windows-py314)	1m 4s
test (ubuntu-py311)	19s
test (windows-pypy3)	59s
test (ubuntu-py39)	24s
test (ubuntu-py312)	21s
test (windows-py39)	51s
test (ubuntu-py310)	23s
test (ubuntu-py313)	20s
test (ubuntu-py314)	34s
test (windows-py313, 3.13, windows-latest, py313)	43s
test (ubuntu-benchmark)	33s
test (ubuntu-pypy3)	43s
deploy	0s
	7m 59s

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