make: Create include directory for make install to install headers. Put ndn-cpp-config.h in include/ndn-cpp.
diff --git a/include/Makefile.am b/include/Makefile.am
new file mode 100644
index 0000000..83757c6
--- /dev/null
+++ b/include/Makefile.am
@@ -0,0 +1,6 @@
+# "make install" will install these in the install include directory, for example
+# /usr/local/include/ndn-cpp/name.hpp.
+# These files are included by the application with, for example
+# #include <ndn-cpp/namp.hpp>
+# Internal include headers are not put in this public install directory.
+nobase_include_HEADERS = ndn-cpp/ndn-cpp-config.h