Add development guide #79

Job	Run time
Format and lint	13s
Type check	25s
Test: Python 3.7 on ubuntu-20.04	26s
Test: Python 3.8 on ubuntu-20.04	18s
Test: Python 3.9 on ubuntu-20.04	25s
Test: Python 3.10 on ubuntu-20.04	21s
Test: Python 3.11 on ubuntu-20.04	20s
Test: Python 3.12 on ubuntu-20.04	24s
Test: Python 3.13 on ubuntu-20.04	27s
Test: Python pypy-3.9 on ubuntu-20.04	51s
Test: Python pypy-3.10 on ubuntu-20.04	48s
Test: Python 3.8 on macos-latest	1m 1s
Test: Python 3.9 on macos-latest	39s
Test: Python 3.10 on macos-latest	40s
Test: Python 3.11 on macos-latest	22s
Test: Python 3.12 on macos-latest	27s
Test: Python 3.13 on macos-latest	22s
Test: Python pypy-3.9 on macos-latest	48s
Test: Python pypy-3.10 on macos-latest	47s
Test: Python 3.8 on windows-latest	1m 10s
Test: Python 3.9 on windows-latest	1m 4s
Test: Python 3.10 on windows-latest	57s
Test: Python 3.11 on windows-latest	1m 19s
Test: Python 3.12 on windows-latest	1m 0s
Test: Python 3.13 on windows-latest	1m 37s
	17m 11s

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