add readme

Author: Peter Linss

README.markdown

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+### [CSS-TAG Houdini Task Force](https://wiki.css-houdini.org/) Specifications
+
+To download a copy of all specifications:
+
+        hg clone https://hg.css-houdini.org/drafts
+
+For help using or setting up Mercurial see instructions [here](http://wiki.csswg.org/tools/hg).  Specification issues are discussed on the
+public [public-wtf mailing list](http://lists.w3.org/Archives/Public/public-wtf/).
+