docs: Add Apache DataFusion to install guide

Author: manuzhang

mkdocs/docs/index.md

@@ -61,6 +61,7 @@ You can mix and match optional dependencies depending on your needs:
 | snappy        | Support for snappy Avro compression                                       |
 | gcsfs         | GCSFS as a FileIO implementation to interact with the object store        |
 | rest-sigv4    | Support for generating AWS SIGv4 authentication headers for REST Catalogs |
+| datafusion    | Installs both PyArrow and Apache DataFusion                               | 
 
 You either need to install `s3fs`, `adlfs`, `gcsfs`, or `pyarrow` to be able to fetch files from an object store.