Add readme.

Author: Awjin

spec/non_conformant/README.md

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+# `non_conformant/`
+
+## Specs that don't conform to the style guide
+
+In an effort to improve the quality of `sass-spec`, all specs that pre-date the
+style guide have been moved to this directory. These specs should remain here
+until they are refactored to follow the style guide. They can be used as a
+starting point for standalone specs or to flesh out existing specs outside of
+`non_conformant/`.