md_browser.py prints example URL & implicitly displays README.md files.

tools/md_browser/md_browser.py

Index: tools/md_browser/md_browser.py
diff --git a/tools/md_browser/md_browser.py b/tools/md_browser/md_browser.py
index 6473eca9ad08f283dddc0e782d743a1dbe8a268c..5ee2fa2c16c58184f18fa1ac209ced385ebcbbf5 100644
--- a/tools/md_browser/md_browser.py
+++ b/tools/md_browser/md_browser.py
@@ -30,6 +30,7 @@ def main(argv):
   try:
     s = Server(args.port, SRC_DIR)
     print("Listening on http://localhost:%s/" % args.port)
+    print(" Try loading http://localhost:%s/docs/README.md" % args.port)
     s.serve_forever()
     s.shutdown()
     return 0
@@ -96,6 +97,8 @@ class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
       self._DoNotFound()
     elif path.lower().endswith('.md'):
       self._DoMD(path)
+    elif os.path.exists(full_path + '/README.md'):
+      self._DoMD(path + '/README.md')
     else:
       self._DoUnknown()