Added basic CI workflow #1

Job	Run time
tests / Load tox environments	7s
publish / Build source and wheel distribution	3m 9s
tests / codestyle (ubuntu-latest)	42s
tests / py37-test (ubuntu-latest)	1m 57s
tests / py38-test (ubuntu-latest)	1m 39s
tests / py39-test (ubuntu-latest)	1m 54s
tests / py310-test (ubuntu-latest)	2m 31s
tests / py37-test (macos-latest)	1m 37s
tests / py38-test (macos-latest)	4m 44s
tests / py39-test (macos-latest)	2m 29s
tests / py310-test (macos-latest)	2m 24s
tests / py37-test (windows-latest)	2m 26s
tests / py38-test (windows-latest)	2m 59s
tests / py39-test (windows-latest)	3m 1s
tests / py310-test (windows-latest)	3m 6s
	34m 45s

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