Add config example.

examples/config.py

@@ -0,0 +1,13 @@
+#!/usr/bin/python
+# Read the config file for a git repository.
+#
+# Example usage:
+#  python examples/config.py
+
+from dulwich.repo import Repo
+
+repo = Repo(".")
+config = repo.get_config()
+
+print config.get("core", "filemode")
+print config.get(("remote", "origin"), "url")