gnu: Add go-github-com-emersion-go-maildir.

* gnu/packages/golang.scm (go-github-com-emersion-go-maildir): New
  variable.

Signed-off-by: Raghav Gururajan <rg@raghavgururajan.name>

gnu/packages/golang.scm

@@ -6744,6 +6744,29 @@ defined by RFC 5321.")
       (description "This package provides an IDLE extension for go-imap.")
       (license license:expat))))
 
+(define-public go-github-com-emersion-go-maildir
+  (package
+    (name "go-github-com-emersion-go-maildir")
+    (version "0.3.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/emersion/go-maildir")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1rs9kbacjpcza25pmdkbm7sdm7r6gq4g44nihi9asyrvspx96zf2"))))
+    (build-system go-build-system)
+    (arguments
+     (list #:import-path "github.com/emersion/go-maildir"))
+    (home-page "https://github.com/emersion/go-maildir")
+    (synopsis "Maildir interface for Go")
+    (description
+     "This package provides an interface to mailboxes in the Maildir
+format.")
+    (license license:expat)))
+
 (define-public go-github-com-fatih-color
   (package
     (name "go-github-com-fatih-color")