update the .gitignore file for R

[eitsupi]

What problem did you solve?

Reflects the update of the original .gitignore file for R.
It also reflects the comments that existed in the original file.

https://github.com/github/gitignore

(If you do not have screenshot) How can I check this pull request?

Check the .gitignore file that is generated by executing the "R: Create gitignore" command from the command palette.

[renkun-ken]

Would it be easier to maintain if we just put the file at R/R.gitignore and just copy the file?

[eitsupi]

Would it be easier to maintain if we just put the file at R/R.gitignore and just copy the file?

That would be great.
In that case, I think GitHub Actions can detect the upstream updates and update that file semi-automatically by using https://github.com/peter-evans/create-pull-request.

[eitsupi]

I noticed that this command now silently overwrites the .gitignore file, so I changed it to ask the user if they want to overwrite it on the last commit.

[eitsupi]

I've isolated the R.gitignore file, but I'm not sure if this is the right way to do it. It does not seem to work on the extension development host.
-> fixed

[renkun-ken]

LGTM