Add the todos-server reference example #3392

Job	Run time
checks / docs	41s
checks / pre-commit	51s
checks / test (3.11, lowest-direct, windows-latest)	1m 56s
checks / test (3.12, lowest-direct, windows-latest)	2m 7s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.10, lowest-direct, windows-latest)	1m 55s
checks / test (3.11, locked, windows-latest)	2m 3s
checks / test (3.14, locked, windows-latest)	2m 46s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.11, locked, ubuntu-latest)	1m 25s
checks / test (3.12, locked, windows-latest)	1m 25s
checks / readme-snippets	12s
checks / test (3.13, lowest-direct, windows-latest)	1m 54s
checks / test (3.13, locked, windows-latest)	2m 6s
checks / test (3.14, locked, ubuntu-latest)	2m 15s
checks / test (3.13, locked, ubuntu-latest)	1m 15s
checks / test (3.10, locked, windows-latest)	2m 13s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, lowest-direct, windows-latest)	1m 39s
checks / test (3.12, locked, ubuntu-latest)	1m 43s
checks / test (3.10, locked, ubuntu-latest)	1m 22s
all-green	6s
	36m 41s

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