Use your favorite plugin manager to install the avm99963/vim-jjdescription
plugin. For instance, with vim-plug you should add the following to the appropriate section in your .vimrc
:
Plug 'avm99963/vim-jjdescription'
This plugin is based on the native syntax highlighting and ftplugin for gitcommit, which is the format of the analogous temporary files used by Git. This is the reason why this plugin is licensed with the Vim license.