Add README

Copy the description from the script's `/help` output with some small
modifications for new viewers.

Include a demo screencast to show the script in action.

2 files changed, 23 insertions, 0 deletions

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diff --git a/README.md b/README.md
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+irssi-vimput
+============
+
+An Irssi plugin that opens the current input line in a new Tmux split in Vim.
+When the Vim buffer is written, Irssi's prompt will be updated from the contents
+of the buffer. For Vimmers, this makes it faster to make complicated edits to a
+message.
+
+
+# Demo
+![screencast](./Demo.gif)
+
+
+# Configuration
+In order to use this script, a binding _must_ be configured to trigger it. For
+example, to bind Ctrl-X:
+
+	/BIND ^X command script exec Irssi::Script::vimput::vimput
+
+
+## License
+Copyright © 2017 Teddy Wing. Licensed under the GNU GPLv3+ (see the included
+COPYING file).