Contributing/Patch: exclude IDE dirs/files

Author: gajdaw

contributing/code/patches.rst

@@ -32,6 +32,18 @@ Set up your user information with your real name and a working email address:
     If you are new to Git, we highly recommend you to read the excellent and
     free `ProGit`_ book.
 
+.. tip::
+
+    If your IDE creates configuration files inside project's directory,
+    you can use ``.git/info/exclude`` file to exclude them. Here is an example
+    rule to exclude ``ide-cfg/`` directory and ``ide.cfg`` file residing inside
+    Symfony 2 folder:
+
+    .. code-block:: text
+
+        /ide-cfg
+        /ide.cfg
+
 .. tip::
 
     Windows users: when installing Git, the installer will ask what to do with