docs(service-worker): add doc to include updates to the index.html with the new ng add command

[sreevani-ship-it]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Currently, the doc does not have content that explains updates to the index.html with the ng add @angular/pwa command.
Issue Number: 23373 #23373

What is the new behavior?

Added doc to explain the updates to index.html file with the ng add @angular/pwa command

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[mary-poppins]

You can preview 0660306 at https://pr23616-0660306.ngbuilds.io/.

[Brocco]

LGTM

[frederikprijck]

There's a typo here, it's gotta be Progressive

[mary-poppins]

You can preview e36d8eb at https://pr23616-e36d8eb.ngbuilds.io/.

[mary-poppins]

You can preview a96507d at https://pr23616-a96507d.ngbuilds.io/.

[jenniferfell]

Please clarify which "installed PWA" because we haven't used that phrase in these docs before. Other comments are optional, but while you're here... :-)

[jenniferfell]

@Brocco: Double-checking...we don't need to say that is adds meta tags for Description?

[sreevani-ship-it]

I checked with him and he confirmed that the Description meta tag is not added.

[jenniferfell]

Unclear reference: We've never mentioned "the installed Progressive Web App (PWA)" using that phrase before. Is this the app/project to which we're currently adding service worker support?

And I don't think we've been clear in the past about what icon file we're adding any why. What's the icon file for? Also....as a developer, I might wonder why you're adding icon files to my app? Is this the file we're talking about: favicon.ico?

[sreevani-ship-it]

My understanding is that we are referring to the project to which we are adding service worker. And icon files are the app's icons. @Brocco : please confirm

[jenniferfell]

Missing comma: Creates the service worker configuration file called ngsw-config.json, which specifies the caching behaviors and other settings.

Also...maybe add a link from this filename to the doc file about config options?

[mary-poppins]

You can preview 759bd8f at https://pr23616-759bd8f.ngbuilds.io/.

[mary-poppins]

You can preview 606db2b at https://pr23616-606db2b.ngbuilds.io/.

[jenniferfell]

I still think we can be more clear about this item:
"Installs icon files to support the installed Progressive Web App (PWA)."

But we can come back as necessary if others are confused. Nothing technically incorrect or missing.

[jenniferfell]

@IgorMinar Hi. The essentials have been updated. With a pull-approve member approval, I think we can merge.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}