Add development guide #80

Job	Run time
Format and lint	15s
Type check	26s
Test: Python 3.7 on ubuntu-20.04	21s
Test: Python 3.8 on ubuntu-20.04	24s
Test: Python 3.9 on ubuntu-20.04	21s
Test: Python 3.10 on ubuntu-20.04	19s
Test: Python 3.11 on ubuntu-20.04	27s
Test: Python 3.12 on ubuntu-20.04	18s
Test: Python 3.13 on ubuntu-20.04	30s
Test: Python pypy-3.9 on ubuntu-20.04	40s
Test: Python pypy-3.10 on ubuntu-20.04	56s
Test: Python 3.8 on macos-latest	1m 0s
Test: Python 3.9 on macos-latest	41s
Test: Python 3.10 on macos-latest	37s
Test: Python 3.11 on macos-latest	22s
Test: Python 3.12 on macos-latest	26s
Test: Python 3.13 on macos-latest	22s
Test: Python pypy-3.9 on macos-latest	55s
Test: Python pypy-3.10 on macos-latest	47s
Test: Python 3.8 on windows-latest	1m 3s
Test: Python 3.9 on windows-latest	1m 16s
Test: Python 3.10 on windows-latest	1m 26s
Test: Python 3.11 on windows-latest	1m 5s
Test: Python 3.12 on windows-latest	1m 4s
Test: Python 3.13 on windows-latest	1m 47s
	17m 48s

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