gnu: Add julia-colortypes.

* gnu/packages/julia-xyz.scm (julia-colortypes-0.8.0): New variable.

gnu/packages/julia-xyz.scm

@@ -1208,3 +1208,27 @@ used in @code{Compose}, @code{Compose3D}, and @code{Escher}.  It allows
 building up and representing expressions involving differing types of units
 that are then evaluated, resolving them into absolute units.")
     (license license:expat)))
+
+(define-public julia-colortypes
+  (package
+    (name "julia-colortypes")
+    (version "0.8.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaGraphics/ColorTypes.jl")
+             (commit (string-append "v" version))))
+       (file-name "ColorTypes")
+       (sha256
+        (base32 "0yskbz6598aaa36502jzq59aqqy0daxcrcxcmhk6jnbb5a1psr95"))))
+    (propagated-inputs `(("julia-compat" ,julia-compat)
+                         ("julia-fixedpointnumbers" ,julia-fixedpointnumbers)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaGraphics/ColorTypes.jl")
+    (synopsis "Basic color definitions and traits")
+    (description "This \"minimalistic\" package serves as the foundation for
+working with colors in Julia.  It defines basic color types and their
+constructors, and sets up traits and show methods to make them easier to work
+with.")
+    (license license:expat)))