docs: README update
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+To successfully compile ndnSIM, it is necessary to use a custom branch of NS-3. 
+
+This branch can be cloned from https://github.com/cawka/ns-3-dev-ndnSIM
+
+        mkdir ndnSIM
+        cd ndnSIM
+        git clone git://github.com/cawka/ns-3-dev-ndnSIM.git ns-3
+        git clone git://github.com/cawka/pybindgen.git pybindgen
+        git clone git://github.com/NDN-Routing/ndnSIM.git ns-3/src/ndnSIM
+
+For more information, including downloading and compilation instruction, please refer to documentation in doc/ or on http://ndnsim.net
+
+