Update README.md

Author: CodingSha

README.md

@@ -14,7 +14,7 @@ Based on this, we believe that it will become the most popular science formula a
 * Very simple code
 * Fast integration
 * Minimal dependency Library
-
+[KaTeX and MathJax Comparison Demo](http://www.intmath.com/cg5/katex-mathjax-comparison.php)
 ##Usage
 
 1. Download all the files in the MathKit subdirectory.