added README

Author: tmthecoder

README.md

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+### Update 6/1: WWDC21 Swift Student Challenge Winner
+
+## MultiCalc
+
+MultiCalc is a multi-purpose calculator that consists of a handwriting-based expression solver and a graphing calculator.
+
+Both the handwriting and graphing calculators were written from scratch. The handwriting calculator was written with Vision and PencilKit while the Graphing calculator uses Core Graphics.
+
+Both calculators use a custom-written EquationParser module which uses a String expression and breaks it up into a set of recursive two-term operations which can be solved with a simple invokation
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+The graphing calculator uses a variable-based implementation of the EquationParser module, which allows for a solve invocation with a supplied number for the variable
+
+The code is extensively documented should you choose to view it and a .zip file has been attached in the releases section. I would love to hear any feedback!