Adding XSLTHL readme

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+To use the syntax higlighting extension with DocBook-XSL 1.74.3+, you must:
+1. Use a processor that works with the extension: Saxon 6 or Xalan-J.
+2. Add the latest version of xslthl-2.X.X.jar to your classpath.
+3. Set the highlight.source parameter to 1.
+4. Import into your customization two stylesheet modules, 
+   highlighting/common.xsl and one of the following:
+  * html/highlight.xsl
+  * xhtml/highlight.xsl
+  * xhtml-1_1/highlight.xsl
+  * fo/highlight.xsl
+5. Use that customiztion layer.
+
+
+Note: Saxon 8.5 or later is also supported, but since it is an XSLT 2.0
+processor it is not guaranteed to work with DocBook-XSL in all
+circumstances. 
+