fix: update schematic readme with examples

[admah]

User facing changelog

• updated README with usage examples

Additional details

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has the original issue or this PR been tagged with a release in ZenHub?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?
• Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

460 • 0 • 6 • 0 • 0

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Run details

Project	cypress
Status	Passed
Commit	a221b9a
Started	May 12, 2021 6:38 PM
Ended	May 12, 2021 6:48 PM
Duration	09:24 💡
OS	Linux Debian - 10.8
Browser	Electron 89

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