Added MathJax Fraction to Fraction Visualizer

I’ve added code to display the fraction the user chooses to the Pie Graph Fraction Visualizer. This code uses MathJax to dynamically display the fraction. As I mentioned in my previous post, the first example I tried from the MathJax website to do this did not work. However, after some more searching, I was able to find this working example on how to dynamically display a MathJax equation from their linked Github.