chore: add LICENSE

[kdihalas]

This pull request adds an open source license to the project by introducing the full text of the Apache License, Version 2.0, in the LICENSE file.

Licensing:

• Added the complete Apache License, Version 2.0, to the LICENSE file, specifying terms for use, reproduction, distribution, and contributions to the project.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.08%. Comparing base (3d8fd00) to head (699456c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   84.08%   84.08%           
=======================================
  Files           4        4           
  Lines         245      245           
=======================================
  Hits          206      206           
  Misses         32       32           
  Partials        7        7           

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