InterestPacket, ContentPacket, Face classes added

diff --git a/model/ndn_interestpacket.cc b/model/ndn_interestpacket.cc
new file mode 100644
index 0000000..3c9d962
--- /dev/null
+++ b/model/ndn_interestpacket.cc
@@ -0,0 +1,13 @@
+//
+//  ndn_interestpacket.cc
+//  Abstraction
+//
+//  Copyright 2011 UCLA. All rights reserved.
+//
+
+#include "ndn_interestpacket.h"
+
+namespace ns3
+{
+
+}
\ No newline at end of file