R function to create restructured data for cross validation

[wdoyle42]

R function that will take data that was read in from ELS and cleaned and will structure it for resampling.

Inputs: data set, type of resampling (k-fold, bootstrap) and resampling options (number of folds, number of replicates)

Outputs: dataset structured for resampling

[btskinner]

To Do

• [x] init function
• [x] add testthat unit tests to check various resampling methods

[wdoyle42]

Resolved via 1af418d6df60bcd331840ff32d9998ac77238e0e