add readme for imap

README.md

@@ -0,0 +1,26 @@
+External user authentication
+============================
+
+Authenticate user login against FTP, IMAP or SMB.
+
+
+## Configuration
+
+### IMAP
+Add the following to your `config.php`:
+
+    'user_backends' => array(
+        array(
+            'class' => 'OC_User_IMAP',
+            'arguments' => array(
+                '{127.0.0.1:143/imap/readonly}',
+            ),
+        ),
+    ),
+
+This connects to the IMAP server on `localhost`.
+
+Read the [imap_open][0] PHP manual page to learn more about the allowed
+parameters.
+
+[0]: http://php.net/imap_open#refsect1-function.imap-open-parameters