2 comparison with momepy

[vanlankveldthijs]

Resolves #2

Added some scripts to compare rcoins strokes to momepy.COINS strokes and a gitHub action to run this comparison on pull request.

There are two scripts

1. R script to read the Bucharest data set, run rcoins stroke on its streets, and save both input and output to a geopandas package.
2. python pytest script to read the geopandas package, run momepy.COINS stroke on its streets, and compare the output to the stored rcoins output.

The gitHub action was tested on a fork of rcoins and runs correctly to completion there.

[fnattino]

Thanks a lot @vanlankveldthijs for automating this, looks good to me!

Could you please add a line to the changelog (NEWS.md file) with a very brief description of this contribution (one sentence) ?

Apart of this I only have a very minor suggestion (new line at end of file). Thanks again!