Add description about docbook2X.

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+This is the Liece documentation in DocBook XML format README.
+===========================================================
+
+We are rewriting the Liece documentation in DocBook XML format.
+For texinfo output, you have to install docbook2X[1] and SAXON[2] (the XSLT processor)
+and follow the instructions below:
+
+(0) Install a Java VM
+(1) Add `saxon.jar' to CLASSPATH.
+(2) Copy docbook2X/texi_xml and docbook2X/xslt to this directory.
+(3) Run `make' in the top directory.
+
+Footnotes: 
+[1]  http://docbook2x.sourceforge.net/
+
+[2]  http://users.iclway.co.uk/mhkay/saxon/