Added FractionMath in C#

[AlexanderORuban]

I Am Adding a New Code Snippet in an Existing Language

• I fixed Add Fraction Math in C# #3314
• I named the pull request using Add {PROJECT} in {LANGUAGE} format

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[rzuckerm]

There is a failure in 2 of the tests, Please see this for details

[AlexanderORuban]

I have solved the failing tests. It turns out for some reason the shorthand '%=' in my code was messing up the remainder in the GCD function.

[rzuckerm]

Good job, @AlexanderORuban . Thanks for your contribution!