gnu: Add r-gitcreds.

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

gnu/packages/cran.scm

@@ -96,6 +96,7 @@ (define-module (gnu packages cran)
   #:use-module (gnu packages statistics)
   #:use-module (gnu packages tcl)
   #:use-module (gnu packages tls)
+  #:use-module (gnu packages version-control)
   #:use-module (gnu packages web)
   #:use-module (gnu packages xml)
   #:use-module (gnu packages xorg))
@@ -9707,6 +9708,30 @@ (define-public r-ini
 back to file after modifications.")
     (license license:gpl3)))
 
+(define-public r-gitcreds
+  (package
+    (name "r-gitcreds")
+    (version "0.1.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "gitcreds" version))
+       (sha256
+        (base32
+         "1snzn7nxy0rwz0bzjsg6k04c0n811dgn8gn9cmn2v78aj57ayjmi"))))
+    (properties `((upstream-name . "gitcreds")))
+    (build-system r-build-system)
+    (inputs `(("git" ,git-minimal)))
+    (native-inputs `(("r-knitr" ,r-knitr)))
+    (home-page "https://github.com/r-lib/gitcreds")
+    (synopsis "Query git credentials from R")
+    (description
+     "Query, set, and delete credentials from the git credential store.
+Manage GitHub tokens and other git credentials.  This package is to be used by
+other packages that need to authenticate to GitHub and/or other git
+repositories.")
+    (license license:expat)))
+
 (define-public r-gh
   (package
     (name "r-gh")