add license tag or badges to the readme file

Checklist

• README updated (where applicable)

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (c25b98f) to head (04b09e3).
Report is 3 commits behind head on master.

❗ Current head 04b09e3 differs from pull request most recent head 247f175

Please upload reports for the commit 247f175 to get more accurate results.

@@            Coverage Diff             @@
##            master     #1732    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          109       101     -8     
  Lines         2489      2005   -484     
  Branches       628       452   -176     
==========================================
- Hits          2489      2005   -484     

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tux-tn previously approved these changes Sep 21, 2021

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