License for this plugin

[yegappan]

I created a PR to port this plugin from Neovim to Vim and include
it natively in Vim:

vim/vim#6414

Bram asked the license for this plugin. Can you include a license
for this plugin (preferably the VIm license)?

[fmoralesc]

Hi! Sure, no problem. Can you help me out with a PR for adding the license? I'm not sure what is the form that it should be included (would a note linking to vim's license suffice, or should we add the full license file?).

Btw, the version that nvim ships is more recent and has a bunch of improvements that I haven't incorporated in this standalone version (it was only meant as a test bed), is your work besed on the version here on the one in the neovim codebase?

[fmoralesc]

I ask because this is not something that we necessarily want to diverge between nvim and vim.

[yegappan]

I ported the version from neovim (with slight modifications to the text to replace
references to nvim with vim).

I am not sure about the legal procedure for including the license. I am assuming
including the Vim license text in the plugin file itself (at the top of the file) or
including a separate LICENSE file with your distribution should be sufficient.

For example, the termdebug plugin distributed with Vim contains the following:

" Copyright: Vim license applies, see ":help license"

The zipPlugin included with Vim contains the following:

" license: vim license (see vim's :help license)

The vimball plugin contains the following:

" Copyright: (c) 2004-2014 by Charles E. Campbell
" The VIM LICENSE applies to Vimball.vim, and Vimball.txt
" (see |copyright|) except use "Vimball" instead of "Vim".
" No warranty, express or implied.

[fmoralesc]

OK. I just added a LICENSING file that makes explicit that vim's license applies.