init cran-comments

Author: jennybc

.Rbuildignore

@@ -15,3 +15,4 @@
 ^codecov\.yml$
 ^man-roxygen$
 ^docs$
+^cran-comments\.md$

cran-comments.md

@@ -0,0 +1,20 @@
+## Test environments
+* local OS X install, R 3.3.2
+* ubuntu 12.04 (on travis-ci), R 3.2.5, R 3.3.1, and
+    R Under development (unstable) (2016-12-30 r71861)
+* Windows Server 2012 R2 x64 (build 9600) (on appveyor), R 3.3.2
+* win-builder (devel and release)
+
+## R CMD check results
+
+0 errors | 0 warnings | 1 note
+
+* This is a new release.
+* This is flagged as a possibly invalid URL (https://www.r-pkg.org/pkg/reprex),
+  but it will resolve properly once the package is on CRAN.
+* The word "runnable" is flagged as possibly mis-spelled, but it appears in
+  several dictionaries, including Merriam-Webster.
+
+## Reverse dependencies
+
+This is a new release, so there are no reverse dependencies.