add small section about username/password authentication to the Readme

svn/resources/README.rst

@@ -280,6 +280,16 @@ diff(start_revision,  end_revision)
 
 Finds all the diff between start and end revision id. Here another key of 'diff' is added which shows the diff of files.
 
+using authentication credentials
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If you need to supply a username and password, you can do so when creating the repository. ::
+
+    import svn.local
+
+    l = svn.local.LocalClient('https://github.com/dsoprea/PySvn.git', username='yourusername', password='yourpassword')
+
+
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