ddidderr 73d8afc8d3 docs: add hard Sudoku example ...

Transcribe the hard 9x9 Sudoku puzzle from the provided image into the
plain-text example format accepted by the solver. The new example gives users a
ready-made input file for manual CLI checks.

Document the example directory in the README project decomposition and include a
command showing how to run the solver against this puzzle.

Test Plan:
- cargo run -- sudoku-examples/hard.sudoku

Refs: none

2026-04-25 21:05:31 +02:00

..

hard.sudoku

docs: add hard Sudoku example

2026-04-25 21:05:31 +02:00