Update README.md

Author: tiborsimon

README.md

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 This Xcode project shows how you can add local mathematical expression rendering to your app with __MathJax__.
 
+<img src="https://raw.githubusercontent.com/tiborsimon/ios-local-mathjax-template/master/mathjax-ios.png" alt="mathjax-ios local integration" width=290 />
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 Download the sources, or read more about this project on [tiborsimon.io/ios/local-mathjax-in-ios-apps/](tiborsimon.io/ios/local-mathjax-in-ios-apps/)