Add development guide #81

Job	Run time
Type check	29s
Format and lint	14s
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	19s
Test: Python 3.10 on ubuntu-20.04	20s
Test: Python 3.11 on ubuntu-20.04	21s
Test: Python 3.12 on ubuntu-20.04	21s
Test: Python 3.13 on ubuntu-20.04	33s
Test: Python pypy-3.9 on ubuntu-20.04	53s
Test: Python pypy-3.10 on ubuntu-20.04	44s
Test: Python 3.8 on macos-latest	1m 8s
Test: Python 3.9 on macos-latest	40s
Test: Python 3.10 on macos-latest	41s
Test: Python 3.11 on macos-latest	25s
Test: Python 3.12 on macos-latest	22s
Test: Python 3.13 on macos-latest	22s
Test: Python pypy-3.9 on macos-latest	45s
Test: Python pypy-3.10 on macos-latest	55s
Test: Python 3.8 on windows-latest	1m 33s
Test: Python 3.9 on windows-latest	55s
Test: Python 3.10 on windows-latest	1m 14s
Test: Python 3.11 on windows-latest	1m 14s
Test: Python 3.12 on windows-latest	1m 14s
Test: Python 3.13 on windows-latest	1m 49s
	18m 14s

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