Bug 85 : Add Makefile to build charms

Signed-off-by: Philip Joseph <philip.joseph@riftio.com>
diff --git a/layers/vyos-proxy/layer.yaml b/layers/vyos-proxy/layer.yaml
index 16ac9ce..dd254f3 100644
--- a/layers/vyos-proxy/layer.yaml
+++ b/layers/vyos-proxy/layer.yaml
@@ -10,3 +10,4 @@
 "includes":
 - "layer:basic"
 "is": "vyos-proxy"
+"repo": "https://osm.etsi.org/gerrit/osm/juju-charms"