Add CRAN comments

.Rbuildignore

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 .git
 .travis.yml
 appveyor.yml
+cran-comments.md

cran-comments.md

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+## Test environments
+* local Ubuntu 16.04 install, R 3.4.4
+* Ubuntu 12.04 (on travis-ci), R 3.4.4
+* Windows Server 2012 (on appveyor), R 3.4.4
+* win-builder (devel)
+
+## R CMD check results
+There were no ERRORs or WARNINGs
+
+There were 2 NOTEs:
+
+* checking CRAN incoming feasibility ... NOTE
+  Maintainer: ‘Paul Hoffman <[email protected]>’
+  Uses the superseded package: ‘doSNOW’
+
+  We use doSNOW instead of doParallel because doSNOW has support for a progress bar while doParallel does not. doSNOW is still on CRAN and works for our purposes
+
+* checking installed package size ... NOTE
+  installed size is  6.7Mb
+  sub-directories of 1Mb or more:
+    libs   5.7Mb
+
+  The large size is due to compiled code. All other directories in our package are under 500K each and the rest of our package is approximately 1.5M in size.
+
+## Downstream dependencies
+
+There are currently no downstream dependencies for this package