added a mirrors file

MIRRORS

@@ -0,0 +1,7 @@
+SquirrelMail Download Mirrors
+
+[Sweeden]     http://yazzy.org/squirrel/
+              ftp://yazzy.org/pub/mirrors/squirrelmail/
+
+[Texas, USA]  http://nerf-herder.net/squirrel/
+              ftp://nerf-herder.net/pub/squirrel/