Add communication section to docs

README.md

@@ -1,11 +1,18 @@
-# GeoMoose3
+# GeoMoose 3
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.7976084.svg)](https://doi.org/10.5281/zenodo.7976084)
 ![Build Status](https://github.com/geomoose/gm3/actions/workflows/tests.yml/badge.svg)
 
 This is the main repository for the new GeoMoose3 library/application. To learn more about GeoMoose [visit the homepage.](http://www.geomoose.org)
 
 
+## Communication
+
+ - [GitHub Discussions](https://github.com/orgs/geomoose/discussions)
+ - [GeoMoose Mailing List](https://lists.osgeo.org/pipermail/geomoose-users/)
+ - [OSGeo Matrix](https://matrix.to/#/#geomoose:osgeo.org)
+
+
 ## Documentation
 
 GeoMoose 3 Documentation found in the `./docs` directory of this repository and is also available online at https://docs.geomoose.org/3.x/