Added submodule information

Change-Id: I2cd423a3b387990d40b8962f929dd5a89d08d181
Signed-off-by: Ashwin Sridharan <hiltunen@att.com>

diff --git a/ext/nanomsg b/ext/nanomsg
new file mode 160000 (submodule)
index 0000000..f861a7c
--- /dev/null
+++ b/ext/nanomsg
@@ -0,0 +1 @@
+Subproject commit f861a7c72bc90fb1f18ffeb2f2a3d1fa59dbc5dd

diff --git a/ext/nng b/ext/nng
new file mode 160000 (submodule)
index 0000000..f723fa9
--- /dev/null
+++ b/ext/nng
@@ -0,0 +1 @@
+Subproject commit f723fa9655e1e7fadc1a15b94b66de674ab9fe17