Add a how to section

README.md

@@ -8,3 +8,7 @@ Change the directory to MiniCalc by using the ```cd``` command. Once inside, run
 
 ### Windows
 Enter PowerShell and change the directory to MiniCalc using ```cd``` command. Then, run the ```.ps1``` file to launch MiniCalc.
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+## How To Use MiniCalc
+MiniCalc can solve any 2 - term (2 number) problem involving addition, subtraction, multiplication, and division. Once in, it should prompt you to choose an operation. To do so, type ```a``` for addition, ```s``` for subtraction, ```m``` for multiplication, or ```d``` for division. Then, it will prompt you to enter the first number. Enter the number to be added, subtracted, multiplied, or divided. Next, it will ask for the second number. Enter the number to be added, subtracted, multiplied, or divided by the first number. Then, it will output your solution.