adding in env example for geoserver

Author: tcnichol

env.example

@@ -101,3 +101,18 @@
 
 # in case of external rabbitmq, the url to clowder
 #RABBITMQ_CLOWDERURL=https://clowder-docker.ncsa.illinois.edu/clowder/
+
+# ----------------------------------------------------------------------
+# GEOSERVER CONFIGURATION
+# ----------------------------------------------------------------------
+
+#PROXY_ON=false
+#PROXY_URL=http://localhost:9000
+
+#GEOSERVER_USERNAME=admin
+#GEOSERVER_PASSWORD=geoserver
+
+#GEOSERVER_WORKSPACE=workspace
+
+#GEOSERVER_USER=admin
+#GEOSERVER_URL=http://localhost:8080