Add tests for R builds

test/testpkg/man/add_it.Rd

@@ -0,0 +1,19 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/testpkg.R
+\name{add_it}
+\alias{add_it}
+\title{Add it together}
+\usage{
+add_it(a, b)
+}
+\arguments{
+\item{a}{Number}
+
+\item{b}{Number}
+}
+\value{
+Sum of numbers
+}
+\description{
+Add it together
+}