explain contribution format

[samijaber]

Description

Please provide the following information:

• What changes you made:

• Why you made them, and:

• Any other useful context:

Make sure to follow the PR preparation steps in CONTRIBUTING.md before submitting your PR:

• format the codebase: from the root, run yarn fmt:prettier.
• update all snapshots (in core & CLI): from the root, run yarn test:update
• add Changeset entry: from the root, run yarn g:changeset and follow the CLI instructions. Alternatively, use the Changeset Github Bot to create the file.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3e51872

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[nx-cloud]

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✅ Successfully ran 3 targets

• nx run-many --target test --verbose
• nx e2e @builder.io/e2e-app --verbose
• nx run-many --target build --exclude @builder.io/e2e-alpine --verbose

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