Added FEX badge

Author: avinsit123

README.md

@@ -2,7 +2,7 @@
 Version 1.0
 
 
-[![View Horizon Chart on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)]()
+[![View Horizon Chart on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/133607-horizon-chart)
 
 ![](horizonFig.png)