Fix LICENSE, add note on Simons Foundation support

[mtfishman]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.00%. Comparing base (c8bc6e5) to head (34a4a21).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #63       +/-   ##
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+ Coverage   75.00%   85.00%   +10.00%     
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  Files           1        1               
  Lines          80       80               
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+ Hits           60       68        +8     
+ Misses         20       12        -8     

Flag	Coverage Δ
docs	75.00% <ø> (ø)

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[mtfishman]

@lkdvos I noticed that the template was using an MIT license, while the Apache license is recommended for software written at the Simons Foundation (also unfortunately all of the packages based on this template will have to be updated). In addition, I've added a support section to the README to acknowledge support from the Simons Foundation.