Create README.md (#996)

Author: t2013anurag

dynamic_css/README.md

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+Need to install scss in order to compile the scss -> http://sass-lang.com/install).
+In order to execute the scss file compile the scss file in dynamic_css folder using the following command-
+
+"scss main.scss main.css"
+
+This will dynamically generate the padding and margin classes in css file(main.css)