Add CRAN comments

.Rbuildignore

@@ -4,3 +4,4 @@
 ^README-.*\.png$
 ^\.travis\.yml$
 ^LICENSE$
+^cran-comments\.md$

cran-comments.md

@@ -0,0 +1,23 @@
+## Test environments
+
+* local OS X install, R 3.4.2
+* ubuntu 12.04 (on travis-ci), R 3.4.2
+* win-builder (devel and release)
+
+## R CMD check results
+
+0 errors | 0 warnings | 1 note
+
+* This is a new release.
+* The URL containing the CRAN badge has yet to be initialized as the package
+  isn't on CRAN. Once listed, this warning will disappear.
+
+> Found the following (possibly) invalid URLs:
+>  URL: http://www.r-pkg.org/pkg/rgen (moved to https://www.r-pkg.org:443/pkg/rgen)
+>    From: README.md
+>    Status: 404
+>    Message: Not Found
+
+## Reverse dependencies
+
+This is a new release, so there are no reverse dependencies.