Docs for the dnd kitten

docs/kittens/dnd.rst

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+Drag and Drop
+==================================================
+
+.. only:: man
+
+    Overview
+    --------------
+
+    *Drag and drop of files from the shell*
+
+.. highlight:: sh
+
+
+The ``dnd`` kitten can be used to drag and drop files between
+the shell and arbitrary GUI programs, it even works over SSH, so you
+can easily and seamlessly transfer files from one computer to another,
+simply by dragging from one kitty window to another.
+Using it is as simple as::
+
+    kitten dnd file-to-drag.xyz
+
+Then, start dragging with the mouse inside the window, and :file:`file-to-drag.xyz`
+will be dragged and you can drop it onto a GUI file manager or another window
+running this kitten. You can specify directories as well to drag entire trees.
+
+Similarly, dropping works by running the kitten::
+
+    kitten dnd
+
+Then, drag some files from a GUI file manager or another window running the dnd kitten
+and drop them onto this window. The files will be copied or moved (depending on
+which area you drop them) into the current working directory.
+
+The best part is this works even over SSH. So if you just want to quickly
+transfer some files from one computer to another all you need to so is ssh into
+the remote computer::
+
+    kitten ssh remote-computer-name
+
+Then, run the dnd kitten on the remote computer::
+
+    kitten dnd files-or-dirs-to-drag
+
+That's it, you can now drag form or drop to the remote computer. See below for
+customising the behavior of the kitten via command line flags.
+
+This kitten uses a new protocol developed by kitty to function, for details,
+see :doc:`/dnd-protocol`.
+
+.. program:: kitty +kitten dnd
+
+
+.. include:: /generated/cli-kitten-dnd.rst