Added preview image

README.md

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-##neonwave
+#neonwave
 A sort of Vaporwave-esque syntax highlighting for Vim. 
 It looks best using [justinmk's vim-syntax-extras](https://github.com/justinmk/vim-syntax-extra)!
+
+
+###Preview
+![Preview](https://cloud.githubusercontent.com/assets/8389374/6772124/2926889e-d0c3-11e4-9761-ca682b3b5797.png)