Added component-state tutorial doc

[rossmc]

Description

Add component-state doc for new tutorial series to help beginners (#2021)

Related Issue

Closes #2070.

Acceptance

Verification Stakeholders

@jcalcaben

Specification

Add Tutorial Doc

Verification Steps

1. Review pwa-devdocs/_drafts/pwa-studio-fundamentals/component-state

Screenshots / Screen Captures (if appropriate)

Checklist

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

[PWAStudioBot]

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[brendanfalkowski]

Would it be better to write this in function components and hooks since most of PWA Studio isn't using class components anymore?

[rossmc]

Would it be better to write this in function components and hooks since most of PWA Studio isn't using class components anymore?

Very good point @brendanfalkowski. I originally wrote these before PWA Studio started using hooks. I had been meaning to update but forgot.

I'll update shortly for this doc and others. Thanks :)

cc @jcalcaben

[rossmc]

c1d75a6 - updated tutorial doc to demonstrate functional component & hooks