Add header for config.h, retab! the file

include/config.h

@@ -1,3 +1,17 @@
+/*
+ * vim:ts=8:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ *
+ * (c) 2009 Michael Stapelberg and contributors
+ *
+ * See file LICENSE for license information.
+ *
+ * include/config.h: Contains all structs/variables for
+ * the configurable part of i3
+ *
+ */
+
 #ifndef _CONFIG_H
 #define _CONFIG_H