Add development guide #75

Job	Run time
Format and lint	16s
Type check	27s
Test: Python 3.7 on ubuntu-20.04	25s
Test: Python 3.8 on ubuntu-20.04	18s
Test: Python 3.9 on ubuntu-20.04	18s
Test: Python 3.10 on ubuntu-20.04	22s
Test: Python 3.11 on ubuntu-20.04	25s
Test: Python 3.12 on ubuntu-20.04	20s
Test: Python 3.13 on ubuntu-20.04	37s
Test: Python pypy-3.9 on ubuntu-20.04	45s
Test: Python pypy-3.10 on ubuntu-20.04	47s
Test: Python 3.8 on macos-latest	1m 9s
Test: Python 3.9 on macos-latest	40s
Test: Python 3.10 on macos-latest	40s
Test: Python 3.11 on macos-latest	22s
Test: Python 3.12 on macos-latest	28s
Test: Python 3.13 on macos-latest	24s
Test: Python pypy-3.9 on macos-latest	49s
Test: Python pypy-3.10 on macos-latest	49s
Test: Python 3.8 on windows-latest	1m 13s
Test: Python 3.9 on windows-latest	1m 6s
Test: Python 3.10 on windows-latest	1m 15s
Test: Python 3.11 on windows-latest	1m 14s
Test: Python 3.12 on windows-latest	1m 20s
Test: Python 3.13 on windows-latest	1m 58s
	18m 27s

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