2011-11-24: added hook tip.

added hook tip.

diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -23,6 +23,12 @@ Usage:
 $ hg site [-n sitename] -u user:password@ftp.host.tld/path/to/dir
 → that’s how this site gets created.
 
+To upload the site when you push, you can use a hook in .hg/hgrc. This is what I use: 
+
+    [hooks]
+    post-push = hg site -n site -u user:password@ftp.host.tld/path/to/dir
+
+
 $ hg site --help
 hg site [options] [folder]