gnu: Add r-pals.

* gnu/packages/cran.scm (r-pals): New variable.

gnu/packages/cran.scm

@@ -1661,6 +1661,31 @@ consistent fashion.  It seeks to combine functionality from lower level
 functions which can speed up workflow.")
     (license license:gpl2)))
 
+(define-public r-pals
+  (package
+    (name "r-pals")
+    (version "1.7")
+    (source (origin
+              (method url-fetch)
+              (uri (cran-uri "pals" version))
+              (sha256
+               (base32
+                "18pbivmqs9yqsb6p8anv42alny0njaq3dajibhzysax0b7rsk2js"))))
+    (properties `((upstream-name . "pals")))
+    (build-system r-build-system)
+    (propagated-inputs
+     (list r-colorspace
+           r-dichromat
+           r-mapproj
+           r-maps))
+    (native-inputs (list r-knitr))
+    (home-page "https://kwstat.github.io/pals/")
+    (synopsis "Color palettes, color maps, and tools to evaluate them")
+    (description
+     "This package provides a comprehensive collection of color
+palettes, color maps, and tools to evaluate them.")
+    (license license:gpl3)))
+
 (define-public r-paralleldist
   (package
     (name "r-paralleldist")