Add development guide #77

Job	Run time
Test: Python 3.7 on ubuntu-20.04	19s
Format and lint	14s
Test: Python 3.8 on ubuntu-20.04	20s
Type check	27s
Test: Python 3.9 on ubuntu-20.04	24s
Test: Python 3.10 on ubuntu-20.04	22s
Test: Python 3.11 on ubuntu-20.04	19s
Test: Python 3.12 on ubuntu-20.04	16s
Test: Python 3.13 on ubuntu-20.04	29s
Test: Python pypy-3.9 on ubuntu-20.04	51s
Test: Python pypy-3.10 on ubuntu-20.04	49s
Test: Python 3.8 on macos-latest	1m 0s
Test: Python 3.9 on macos-latest	39s
Test: Python 3.10 on macos-latest	39s
Test: Python 3.11 on macos-latest	23s
Test: Python 3.12 on macos-latest	22s
Test: Python 3.13 on macos-latest	26s
Test: Python pypy-3.9 on macos-latest	1m 12s
Test: Python pypy-3.10 on macos-latest	55s
Test: Python 3.8 on windows-latest	1m 11s
Test: Python 3.9 on windows-latest	1m 4s
Test: Python 3.10 on windows-latest	1m 15s
Test: Python 3.11 on windows-latest	1m 10s
Test: Python 3.12 on windows-latest	1m 5s
Test: Python 3.13 on windows-latest	1m 41s
	17m 52s

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