gnu: Add emacs-neotree.

* gnu/packages/emacs.scm (emacs-neotree): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu/packages/emacs.scm

@@ -2941,3 +2941,22 @@ news items, openrc and runscripts.")
 in English as you type.  It primarily detects \"weasel words\" and abuse of
 passive voice.")
     (license license:gpl3+)))
+
+(define-public emacs-neotree
+  (package
+    (name "emacs-neotree")
+    (version "0.2.1")
+    (home-page "https://github.com/jaypei/emacs-neotree")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://github.com/jaypei/" name
+                    "/archive/v" version ".tar.gz"))
+              (sha256
+               (base32
+                "0cr37pdkwjgfijfws5bjskfh1rq9rfngxblcj6v5383vpmn83q7s"))
+              (file-name (string-append name "-" version))))
+    (build-system emacs-build-system)
+    (synopsis "Folder tree view for Emacs")
+    (description "This Emacs package provides a folder tree view.")
+    (license license:gpl3+)))