Moved and renamed CalculatedMultiplesOf3and5.csv to Problem1.csv from the project solution items to ./Problemstests/TestsValues/... because these values are for testing only and there is no need for them to be in root.

The file may have been under the solution items however it did not update to be moved to the root folder of the solution causing it to not be marged into source.  Having moved and renamed the file fixed this issue.