added simple landscape-pennylane example

[dubeyPraY]

Description

--- Implemented a PennyLane variant of the simple landscape example. #1333

License

• [ ✓] I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• I added unit tests for new code.
• I used type hints in function signatures.
• I used Google-style docstrings for functions.
• [✓ ] I updated the documentation where relevant.
• [ ✓] Added myself / the copyright holder to the AUTHORS file

[github-actions]

Hello @dubeyPraY, thank you for submitting a PR to Mitiq! We will respond as soon as possible, and if you have any questions in the meantime, you can ask us on the Unitary Fund Discord.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (b6cb5c1) 98.28% compared to head (985d530) 98.30%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2009      +/-   ##
==========================================
+ Coverage   98.28%   98.30%   +0.01%     
==========================================
  Files          86       87       +1     
  Lines        4084     4118      +34     
==========================================
+ Hits         4014     4048      +34     
  Misses         70       70              

see 3 files with indirect coverage changes

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[Misty-W]

Closed by mistake.

[Misty-W]

Closed by mistake. Reopening.

I don't have access to this branch, as it's on a fork.