Create CONTRIBUTING.md #1105

Job	Run time
conda package build	1m 21s
build python package	34s
lint commit message	27s
linting-linux	5s
mypy check on linux (3.9)	53s
mypy check on linux (3.10)	53s
pytest on linux (3.9)	1m 31s
pytest on linux (3.10)	1m 30s
mypy check on linux (3.11)	47s
pytest on linux (3.11)	1m 33s
mypy check on linux (3.12)	56s
pytest on linux (3.12)	1m 45s
mypy check on linux (3.13)	1m 38s
pytest on linux (3.13)	1m 42s
test coverage	4s
merge current tag to main branch	0s
publish python package to anaconda	0s
publish python package	0s
	15m 39s

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