Add known libraries that support GeoParquet to README (#29)

Co-authored-by: Chris Holmes <[email protected]>

README.md

@@ -78,9 +78,11 @@ will be any more potential breaking changes. Though the full commitment to that
 
 ## Current Implementations & Examples
 
-TODO: Add explanations and links to implementations.
-
-Examples of geoparquet files following the current spec can be found in the [examples/](examples/) folder.
-
+Examples of geoparquet files following the current spec can be found in the [examples/](examples/) folder. There is also a 
+larger sample dataset [nz-buildings-outlines.parquet](https://storage.googleapis.com/open-geodata/linz-examples/nz-buildings-outlines.parquet)
+available on Google Cloud Storage.
 
+Currently known libraries that can read and write GeoParquet files:
 
+* [GeoPandas](https://geopandas.org/en/stable/docs/user_guide/io.html#apache-parquet-and-feather-file-formats) (Python)
+* [sfarrow](https://wcjochem.github.io/sfarrow/index.html) (R)