Create DISCLAIMER.md

[ilaflott]

Describe your changes

adds additional legal disclaimer + copyright exemption for the package to stay compliant with NOAA policy

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.83%. Comparing base (26a1acf) to head (d67cca2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
=======================================
  Coverage   94.83%   94.83%           
=======================================
  Files          11       11           
  Lines        1336     1336           
=======================================
  Hits         1267     1267           
  Misses         69       69           

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