Update README and add contrib dir

contrib/real-device/CMakeLists.txt

@@ -0,0 +1,24 @@
+check_include_file_cxx(stdint.h HAVE_STDINT_H)
+if(HAVE_STDINT_H)
+    add_definitions(-DHAVE_STDINT_H)
+endif()
+
+set(examples_as_tests_sources)
+if(${ENABLE_EXAMPLES})
+    set(examples_as_tests_sources
+        #test/real-device-examples-test-suite.cc
+        )
+endif()
+
+build_lib(
+    LIBNAME real-device
+    SOURCE_FILES model/evb-lan9668.cc
+                 helper/real-device-helper.cc
+    HEADER_FILES model/evb-lan9668.h
+                 helper/real-device-helper.h
+    LIBRARIES_TO_LINK ${libcore}
+                      ${libethernet}
+                      ${libtsn}
+    TEST_SOURCES test/real-device-test-suite.cc
+                 ${examples_as_tests_sources}
+)