Add SHA256 hashing example for issue #142Add SHA256 hashing example for issue #142Create sha256_usage.py

[mathurojus]

This example demonstrates the usage of create_puzzles with SHA256 hashing function and custom salt/spice values, addressing issue #142.

[vil02]

@mathurojus: thank for creating this PR! Few remarks:

• the examples are required to use the same set of questions and answers. Otherwise the check_examples part will fail (cf. run_all_examples.sh),
• the used hash defaults to sha512. Maybe it is worth mentioning that using shorter hashes like sha256 or md5 reduces the output size (it is just a puzzle, so one should not be to concerned with the security).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (17d1043) to head (f4483dd).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           15        15           
  Lines          309       309           
  Branches        26        26           
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  Hits           309       309           

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[vil02]

@mathurojus : by the way: this repository has the hacktoebrfest tag, so this PR will count as your hacktoberfest contribution (as soon as it will be merged).