Update service worker doc getting started pre cli #693

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[ ] Feature request
[X ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

Expected behavior

Comment from PR 23348: “This looks really good, just want to raise awareness that it will need updated once angular/angular-cli#693 gets merged, as it will also be updating the index.html file for the project which should be reflected here as well.”

Need to change service worker getting started where we list what the ng add command does.

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

Angular version: X.Y.Z


Browser:
- [ ] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

[jenniferfell]

@Brocco: Thanks!!

@chembu : This one’s ready to start work. Info above. Thanks!

[Brocco]

I apologize, the right reference is this PR: angular/devkit#693 (which has since been merged).

@jenniferfell The docs look great, but there are a couple of things this command does which was not captured.

• Updates index.html to include:
  • link to add the manifest.json
  • meta tags for Description and theme-color
• Installs icon files to support the installed PWA