Add the Sketch-n-Sketch paper (papers-we-love#412)

Author: schuster

languages/domain-specific-languages/README.md

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+[Programmatic and Direct Manipulation, Together at Last](http://arxiv.org/abs/1507.02988). Ravi
+Chugh, Brian Hempel, Mitchell Spradlin, and Jacob Albers. PLDI 2016.
+> Introduces the idea of "prodirect manipulation" for creating visual artifacts,
+> a hybrid of the direct manipulation technique used in WYSIWYG programs like
+> Photoshop and PowerPoint, and the programmatic manipulation used in languages
+> and libraries such as LaTeX and Processing.