add license to crates for packaging

[martintc]

I'm submitting a

• bug fix
• feature
• documentation addition

What is the current behaviour?

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

Some methods of packaging have a preference for having the license file in the root of the project. Ravenports is an example. This should allow for adding license files property to port systems.

What is the expected behavior?

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

Version (comtrya --version): v.0.8.4
Operating system:

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (616c578) 45.83% compared to head (713060b) 45.83%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #334   +/-   ##
=======================================
  Coverage   45.83%   45.83%           
=======================================
  Files          83       83           
  Lines        2987     2987           
=======================================
  Hits         1369     1369           
  Misses       1618     1618           

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