Update the README with build instuctions

git-svn-id: http://ots.googlecode.com/svn/trunk@28 a4e77c2c-9104-11de-800e-5b313e0d2bf3
diff --git a/README b/README
index b74d519..53cd282 100644
--- a/README
+++ b/README
@@ -15,6 +15,10 @@
 Thus, the OpenType Sanitiser (OTS) is designed to parse and serialise OpenType
 files, validating them and sanitising them as it goes.
 
-This is just an initial release. Do not use it in anger yet.
+Building:
+
+The included ots.gyp file is for building within the Chromium only. In the
+test/ directory you'll find a SConstruct file which can be used with scons to
+build a standalone version.
 
 [1] http://www.w3.org/TR/CSS2/fonts.html#font-descriptions