Add keywords field to pubspec.yaml

[nex3]

From @anders-sandholm on August 11, 2017 13:56

From @mnordine on August 11, 2017 12:59

Search results on https://pub.dartlang.org/ could be improved with the addition of keywords for packages. It could also improve the home page by listing packages via popular keywords. For prior art, see https://crates.io/ and http://doc.crates.io/manifest.html

From the previous link:

# This is a list of up to five keywords that describe this crate. Keywords
# are searchable on crates.io, and you may choose any words that would
# help someone find this crate.v
keywords = ["...", "..."]

Copied from original issue: dart-lang/sdk#30418

Copied from original issue: dart-lang/pub#1686

[isoos]

We already index description and the first part of readme. I'm not sure what another free-form text field could add to this, unless we want to promote these keywords somehow else. Thoughts?

[Ali-Azmoud]

@isoos

We already index description and the first part of readme.

No you don't. for example, you can't find Flutter Xlider by keywords xlider, flutter xlider, (Flutter Xlider) on google, while these words are inside the first part of readme. description as well

[isoos]

@Ali-Azmoud: When I was saying we index description and the first part of the readme, I was referring to the pub site. The pub site searches for xlider and flutter xlider bring up the package as the first hit.

We also do expose lots of metadata for Google search to index the site, but we don't have direct influence on when, how and with what relevance it will happen.

[mit-mit]

Closing as a duplicate of #5219 (that uses a slightly different mechanism for specifying the tags, but logically it's similar).