Add a PR description template

[FlxPo]

Motivation

See #285

Changes

• Added a template in .github/pull_request_template.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.06%. Comparing base (db01023) to head (58b0136).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files         129      129           
  Lines        6738     6738           
=======================================
  Hits         3980     3980           
  Misses       2758     2758           

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