Added comments

docker_get_data_volume_info.sh

@@ -4,18 +4,23 @@
 echo "List of all volumes:"
 echo 
 
+#Loop over all the data volumes
 for docker_volume_id in $(docker volume ls -q)
 do
 	echo "(Un)named volume: ${docker_volume_id}"
 	
-	
+	#Obtain the size of the data volume by starting a docker container
+	#that uses this data volume and determines the size of this data volume	
 	docker_volume_size=$(docker run --rm -t -v ${docker_volume_id}:/volume_data ubuntu bash -c "du -hs /volume_data | cut -f1" ) 
 
 	echo "    Size: ${docker_volume_size}"
 	
-
+	#Determine the number of stopped and running containers that
+	#have a connection to this data volume
 	num_related_containers=$(docker ps -a --filter=volume=${docker_volume_id} -q | wc -l)
 
+	#If the number is non-zero, we show the information about the container and the image
+	#and otherwise we show the message that are no connected containers
 	if (( $num_related_containers > 0 )) 
 	then
 		echo "    Connected containers:"