Add sample instructions for fetching images. Make sample config match these instructions.
diff --git a/include/sample_vm/README.txt b/include/sample_vm/README.txt
index 5741eff..e8895ea 100644
--- a/include/sample_vm/README.txt
+++ b/include/sample_vm/README.txt
@@ -1 +1,6 @@
-You will need to download an image into this directory.. Will also need to update the tests to reference this new image.
+You will need to download an image into this directory..
+Will also need to update the tests to reference this new image.
+
+You could use e.g. the Ubuntu Natty cloud images (this matches the sample configuration):
+$ wget http://cloud-images.ubuntu.com/releases/natty/release/ubuntu-11.04-server-uec-amd64.tar.gz
+$ tar xvzf ubuntu-11.04-server-uec-amd64.tar.gz