Add README for TextAlignmentControl component

[im3dabasia]

Part of: #22891
Follow up: #67371

What?

This PR adds a README for the TextAlignmentControl component.

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Co-authored-by: im3dabasia <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[im3dabasia]

Hey @t-hamano, could you please review this PR when you have a moment?

Thanks! 🙇

[t-hamano]

Thanks for the PR!

You probably looked at the README for the TextDecorationControl component, but I noticed that the heading levels are incorrect.

The correct format should be as follows.

If there is the developer guidelines:

# ComponentName

## Development guidelines

### Usage

### Props

#### prop

If there is no developer guidelines:

# ComponentName

## Usage

## Props

### prop

I think there is no developer guidelines for this component, so could you use the latter format and correct the heading levels?

[im3dabasia]

Hi @t-hamano,

I’ve removed the justify option as it wasn’t present by default, and I’ve also corrected the headings to use the appropriate # levels.

Could you please review the PR again and share your feedback?

[t-hamano]

Thanks for the update! Could you make one last change?

[im3dabasia]

Hey @t-hamano , Thank you very much for the follow up. I have made the requested changes please check.

[t-hamano]

LGTM 👍