Resource Calculator (for mobile games)

A little bit of custom code practice! A calculator for calculating resource amounts for mobile games. Edit (10/17/2020): Updated the custom code to be a lot more scalable and manageable. Definitely a lot more optimization that can be done, but it was a major improvement over the old code. Also added a check for whether or not the resources needed if positive, negative, or neutral, and used that to trigger special classes to change the color of the "Resources Needed" containers!