Add license statement.

[litingulfs]

This PR just adds a missing license statement.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.25%. Comparing base (52ba813) to head (880b4f2).
Report is 140 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2941      +/-   ##
============================================
+ Coverage     64.24%   70.25%   +6.01%     
- Complexity    10398    12014    +1616     
============================================
  Files           840      867      +27     
  Lines         71755    73783    +2028     
  Branches       8611     8887     +276     
============================================
+ Hits          46099    51837    +5738     
+ Misses        23004    19246    -3758     
- Partials       2652     2700      +48     

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