create README to point people to places for stuff

Author: tantek

css-scrollbars-1/README.md

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+CSS Scrollbars - for specifying scrollbar styling with CSS, 
+scoped to just enough to get minimally sufficient compat with existing implementations to satisfy existing real world use-cases.
+
+Editor's Draft: https://drafts.csswg.org/css-scrollbars-1 
+
+Wiki: https://www.w3.org/wiki/Css-scrollbars
+
+Issues: https://github.com/w3c/csswg-drafts/labels/css-scrollbars-1