first pass on novice r reference sheet

addresses #663

First pass on the reference sheet.

almost just typed in any function/code I saw

Lots of work to do, but it's a start.
This comment and the use of `somethingThatsTRUEorFALSE` in both the `if()` and `else` branches is confusing. It certainly won't `do if above is FALSE` - only if it is `TRUE`, but if it were `TRUE` you'd be in the first branch of this `if else` statement.