Update README and add contrib dir

contrib/ethernet/test/examples-to-run.py

@@ -0,0 +1,26 @@
+#! /usr/bin/env python3
+
+# A list of C++ examples to run in order to ensure that they remain
+# buildable and runnable over time.  Each tuple in the list contains
+#
+#     (example_name, do_run, do_valgrind_run).
+#
+# See test.py for more information.
+cpp_examples = [
+    ("ethernet-point2point", "True", "True"),
+    ("ethernet-point2point-withPropagationDelay", "True", "True"),
+    ("ethernet-point2point-withSmallFifo", "True", "True"),
+    ("ethernet-point2point-10Gb", "True", "True"),
+    ("ethernet-switched", "True", "True"),
+    ("ethernet-switched-withLatencyCallback", "True", "True"),
+    ("ethernet-switched-withPcap", "True", "True"),
+    ("ethernet-switched-withRxTxCallback", "True", "True"),
+]
+
+# A list of Python examples to run in order to ensure that they remain
+# runnable over time.  Each tuple in the list contains
+#
+#     (example_name, do_run).
+#
+# See test.py for more information.
+python_examples = []