Add missing license header

[jbowes]

No description provided.

[codecov]

Codecov Report

Merging #6 (deba5a1) into main (cc9b992) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   57.98%   57.98%           
=======================================
  Files           5        5           
  Lines         338      338           
=======================================
  Hits          196      196           
  Misses        106      106           
  Partials       36       36           

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