Add ftplugin files for Jinja

[Freed-Wu]

Comes from #15689 (comment)

[chrisbra]

thanks, but why is the maintainer @gpanders but the repo under @HiPhish ?

Also, I'd prefer if the upstream maintainer sends this over so we are in agreement here.

[Freed-Wu]

why is the maintainer

Fixed.

if the upstream maintainer sends this

I ask it in HiPhish/jinja.vim#9

so we are in agreement here.

In fact, https://github.com/HiPhish/jinja.vim/blob/master/ftplugin/jinja.vim only has one line, so I think it is not a large problem.

[chrisbra]

@HiPhish can you please confirm here?

[HiPhish]

Hi, what exactly is the issue here? It's one line of trivial Vim script, I highly doubt that I could copyright that. If you want my permission to copy & paste it, then yes sure, do whatever you want with it.

Is there something I can do for you in order to avoid legal ambiguity in the future? Maybe put an SPDX license identifier at the top? Use the Unlicense to effectively place the file in the public domain?

[chrisbra]

Thanks. No that won't be required. We just prefer to have an explicit consensus before we include a change someone authored. (I believe that was Brams preference and I also prefer this for the reason to be explicit).

Although the license would allow it, I think it is good style to get explicit acknowledgement from the authors.

I include it then.