Initial add
Added mutliplcation tests for calculator.

* learned that getting the tests to pass was like going to Vegas and rolling a 7!

[#48785379]
Merge pull request #1 from run4kelly/48785379_multiply_method_master

Added mutliplcation tests for calculator.

[Delivers #48785379]
Add division tests

* Learned we needed lambda (we don't know what it does)

* Used raise exception on strings

[#48785387]
Merge pull request #2 from run4kelly/48785387_divide_method_master

Add division tests

[Delivers #48785387]
Added inital square root test

* learned about Math.sqrt

[#48785399]
Merge pull request #3 from run4kelly/48785399_squareroot_master

Added inital square root test

[Delivers #48785399]