Add a package description

[ilovehackathons]

This description is shown e.g. when hovering with the cursor over the package name in VSCode.

This is what VSCode currently shows:

This is how it should look like:

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.25% 🎉

Comparison is base (b56f209) 95.65% compared to head (5bb5b3f) 95.90%.
Report is 2 commits behind head on master.

❗ Current head 5bb5b3f differs from pull request most recent head ae7e290. Consider uploading reports for the commit ae7e290 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #775      +/-   ##
==========================================
+ Coverage   95.65%   95.90%   +0.25%     
==========================================
  Files          19       19              
  Lines        1058     1050       -8     
==========================================
- Hits         1012     1007       -5     
+ Misses         46       43       -3     

see 2 files with indirect coverage changes

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[cgewecke]

Great!