Document GPX File Parsing Provider

Beautiful step-by-step guide on how to make GPX work with Geofield and Geocoder in #12 → , thanks @FMB! Based on those steps, I created the documentation page Using GPX files with Geocoder and Geofield → .

@ressa great, thanks! Do you think the README also needs to be updated?

ressa → changed the visibility of the branch 2747193-implement-gpx-file to hidden.

Great idea @FMB! I added https://git.drupalcode.org/issue/geocoder-2747193/-/blob/2747193-4x/READ....