gnu: Add r-codetools.

* gnu/packages/statistics.scm (r-codetools): New variable.

gnu/packages/statistics.scm

@@ -730,3 +730,19 @@ generation in R using Literate Programming techniques.")
      "This package provides infrastructure to accurately measure and compare
 the execution time of R expressions.")
     (license license:bsd-2)))
+
+(define-public r-codetools
+  (package
+    (name "r-codetools")
+    (version "0.2-14")
+    (source (origin
+              (method url-fetch)
+              (uri (cran-uri "codetools" version))
+              (sha256
+               (base32
+                "0y9r4m2b8xgavr89sc179knzwpz54xljbc1dinpq2q07i4xn0397"))))
+    (build-system r-build-system)
+    (home-page "https://cran.r-project.org/web/packages/codetools/index.html")
+    (synopsis "Code analysis tools for R")
+    (description "This package provides code analysis tools for R.")
+    (license license:gpl3+)))