Add a small documentation
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+Examples
+========
+
+Simple scenario
+---------------
+
+The first example (``ccnx-simple.cc``) shows very basics of ndnSIM. In the simulated
+topology there are 3 nodes, connected with point-to-point links, one
+NDN consumer, and one NDN producer::
+
+ +----------+ 1Mbps +--------+ 1Mbps +----------+
+ | consumer | <------------> | router | <------------> | producer |
+ +----------+ 10ms +--------+ 10ms +----------+
+
+Consumer requests data from producer with frequency 10 interests per second
+(interests contain constantly increasing sequence number).
+
+For every received interest, producer replies with a data packet, containing
+1024 bytes of virtual payload.
+
+The following code represents all that is necessary to run such a
+simple scenario
+
+.. code-block:: c++
+
+ #include "ns3/core-module.h"
+ #include "ns3/network-module.h"
+ #include "ns3/point-to-point-module.h"
+ #include "ns3/ndnSIM-module.h"
+
+ using namespace ns3;
+
+ int
+ main (int argc, char *argv[])
+ {
+ // setting default parameters for PointToPoint links and channels
+ Config::SetDefault ("ns3::PointToPointNetDevice::DataRate", StringValue ("1Mbps"));
+ Config::SetDefault ("ns3::PointToPointChannel::Delay", StringValue ("10ms"));
+ Config::SetDefault ("ns3::DropTailQueue::MaxPackets", StringValue ("20"));
+
+ // Creating nodes
+ NodeContainer nodes;
+ nodes.Create (3);
+
+ // Connecting nodes using two links
+ PointToPointHelper p2p;
+ p2p.Install (nodes.Get (0), nodes.Get (1));
+ p2p.Install (nodes.Get (1), nodes.Get (2));
+
+ // Install CCNx stack on all nodes
+ CcnxStackHelper ccnxHelper;
+ ccnxHelper.SetDefaultRoutes (true);
+ ccnxHelper.InstallAll ();
+
+ // Installing applications
+
+ // Consumer
+ CcnxAppHelper consumerHelper ("ns3::CcnxConsumerCbr");
+ // Consumer will request /prefix/0, /prefix/1, ...
+ consumerHelper.SetPrefix ("/prefix");
+ consumerHelper.SetAttribute ("Frequency", StringValue ("10")); // 10 interests a second
+ consumerHelper.Install (nodes.Get (0)); // first node
+
+ // Producer
+ CcnxAppHelper producerHelper ("ns3::CcnxProducer");
+ // Producer will reply to all requests starting with /prefix
+ producerHelper.SetPrefix ("/prefix");
+ producerHelper.SetAttribute ("PayloadSize", StringValue("1024"));
+ producerHelper.Install (nodes.Get (2)); // last node
+
+ Simulator::Stop (Seconds (20.0));
+
+ Simulator::Run ();
+ Simulator::Destroy ();
+
+ return 0;
+ }
+
+If NS-3 is compiled in debug mode, you can run and see progress of the
+simulation using the following command::
+
+ NS_LOG=CcnxConsumer:CcnxProducer ./waf --run=ccnx-simple