Added copyright

[forman]

Inserted copyright header into all source files.

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.45%. Comparing base (c713b15) to head (b2df512).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   99.45%   99.45%           
=======================================
  Files          66       66           
  Lines        2746     2746           
  Branches      401      401           
=======================================
  Hits         2731     2731           
  Partials       15       15           

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