chore: prepare repository for Gitea publication

Geo/README.md

@@ -4,6 +4,8 @@ Geographic sources, manifests, and the scripts that turn them into Blender impor
 
 OSM is layout data only. It is not authoritative for façade detail, height, or pavement, and it is never sampled as a texture or panorama source.
 
+The OSM source files are © OpenStreetMap contributors, available under the [Open Database License 1.0](https://opendatacommons.org/licenses/odbl/1-0/); see [OpenStreetMap attribution](https://www.openstreetmap.org/copyright). Public use of a derivative database can require sharing that database or the changes needed to recreate it under ODbL. Review the applicable obligations for each distributed product.
+
 ## Layout
 
 | Path | Contents |