Add COPYRIGHT file and update LICENSE

[xtqqczze]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks
⏩ 9 skipped benchmarks¹

---

_{Comparing xtqqczze:license (c440831) with main (fb2c909)}

Footnotes

1. 9 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.12%. Comparing base (3f5db7d) to head (c440831).
⚠️ Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   78.64%   85.12%   +6.48%     
==========================================
  Files          13       15       +2     
  Lines        2585     3490     +905     
  Branches      230      246      +16     
==========================================
+ Hits         2033     2971     +938     
+ Misses        552      518      -34     
- Partials        0        1       +1     

Flag	Coverage Δ
macos_latest	84.58% <ø> (+6.94%)	⬆️
ubuntu_latest	84.69% <ø> (+6.51%)	⬆️
windows_latest	17.33% <ø> (+2.63%)	⬆️

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[cakebaker]

Thanks!