Update README.md

Author: SkyeStarfall

README.md

@@ -1,2 +1,21 @@
 # Math-Expression-Parser
 A small console program to parse string math expressions
+
+The nth-root formula is n%num
+n is for the nth root
+% is the substitude for the root symbol
+num is the number to be rooted
+
+Everything else
+Parenthesis - ()
+Nth-Root - %
+Exponentiation - ^
+Multiplication - *
+Division - /
+Addition - +
+Substraction - -
+
+W visible calculation prints the formula multiple times as it is being calculated and changed
+WO visible calculation just shows the answer
+
+Digits are supported, use a full stop - .