Add simple charm from hackfest

Signed-off-by: Adam Israel <adam.israel@canonical.com>
Change-Id: Ic6faa32f233209fec0a3eb5cfa211beec8fb161b
diff --git a/juju-charms/Makefile b/juju-charms/Makefile
index 65c3b0e..690904e 100644
--- a/juju-charms/Makefile
+++ b/juju-charms/Makefile
@@ -17,7 +17,7 @@
 
 BUILD_DIR = .
 
-CHARMS:= pingpong vyos-proxy netutils
+CHARMS:= pingpong vyos-proxy netutils simple
 CHARM_SRC_DIR := layers
 CHARM_BUILD_DIR := $(BUILD_DIR)/builds