improving readme

README.md

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-java-wkhtmltopdf-wrapper
-========================
+WkHtmlToPdf Wrapper
+=========
 
-A Java wrapper for wkhtmltopdf
+A Java based wrapper for the [wkhtmltopdf](http://wkhtmltopdf.org/) command line tool. As the name implies, it uses WebKit to convert HTML documents to PDFs.
+
+**The [wkhtmltopdf](http://wkhtmltopdf.org/) command must be installed and working on your system.**
+
+### TODO - Complete