created an example configuration

example.yml

+---
+# Modify these to suit your needs.
+image: "gizmonic.cs.umd.edu:8080/baseline"
+image_cmd: "tail -f /etc/issue"
+
+# Here's how you define the network you want.
+# The topology can be "mesh" or "star". The
+# latter will designate the first node as the
+# center of the star.
+network:
+  num_nodes: 4
+  topology: mesh
+  subnet_addr: 186.192.0.0
+  subnet_len: 16
+