A major mode for editing [NDBL](https://github.com/aisamanra/ndbl) files.
This mode is also available through a package archive hosted at
[`gelpa.gdritter.com`](http://gelpa.gdritter.com/), which means you can
install it by adding

~~~~
(add-to-list 'package-archives '("gelpa" . "http://gelpa.gdritter.com/") t)
(use-package ndbl-mode :ensure t)
~~~~

to your `.emacs`.