docs: update README for @cypress/react (add commands to run tests)

[BeijiYang]

User facing changelog

n/a

Additional details

When I tried to add Cypress component tests into my React app, this README file helped me a lot.

But I got stuck for a while after installing and initialization. I didn't know how to run the component tests. It cost some time to figure it out.

So I added these commands in the README, hope this can save some beginners some time.

How has the user experience changed?

n/a

PR Tasks

• [n/a] Have tests been added/updated?
• [n/a] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [n/a] Has a PR for user-facing changes been opened in cypress-documentation?
• [n/a] Have API changes been updated in the type definitions?

[cypress-bot]

Thanks for taking the time to open a PR!

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.
• Become familiar with the Code Review Checklist for guidelines on coding standards and what needs to be done before a PR can be merged.

[CLAassistant]

All committers have signed the CLA.

[lmiller1990]

As of Cypress 10, adding React and Component Testing should be a lot easier. You might want to try setting up a React project with Cypress 10, if you haven't already - it's almost completely automated.

Thanks for the PR either way 👍

[lmiller1990]

Will look to get this one merged - need to trigger a CI run for this.

[BeijiYang]

Thank you! I'm glad that I can contribute to such a great repo.

[cypress]

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Test summary

37681 • 0 • 456 • 0 • 10

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Run details

Project	cypress
Status	Passed
Commit	544c9dc
Started	Jun 28, 2022 11:15 PM
Ended	Jun 28, 2022 11:35 PM
Duration	19:34 💡
OS	Linux Debian - 10.11
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	actions/click.cy.js		1
1	... > scroll-behavior > can scroll to and click elements in html with scroll-behavior: smooth
	xhr.cy.js		4
1	... > logs request + response headers
2	... > logs Method, Status, URL, and XHR
3	... > logs response
4	... > logs response
This comment includes only the first 5 flaky tests. See all 10 flaky tests in the Cypress Dashboard.

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard