Use GitHub .gitignore template for Node.js

[yvan-sraka]

No description provided.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[yvan-sraka]

I signed it!

[googlebot]

CLAs look good, thanks!

[lincolnfrog]

Please include all the ignores that are already in .gitignore in addition to adding these new entries.

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored by someone other than the pull request submitter. We need to confirm that they're okay with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of the commit author(s) and merge this pull request when appropriate.

[niksumeiko]

@googlebot, I confirm I'm okay my commits are contributed to this project. Actually that was the purpose.

[yvan-sraka]

@niksumeiko I have merged your changes, thanks!

[yvan-sraka]

@lincolnfrog we followed your request!

[niksumeiko]

@lincolnfrog, @yvan-sraka, I know PR is already merged and closed, but I wished to discuss with you, what we do with package-lock.json?

From official documentation:

This file is automatically generated for any operations where npm modifies either the node_modules/ tree, or package.json. This file is intended to be committed into source repositories.

Currently, it's not listed in .gitignore and shan't be, I think. So anyone actually can commit/push this file any time…

What do you guys think?