docs: add a readme for transforms example

[witherblock]

• Add a README for the transforms example
• Add the build command to the package.json
• Add the graphql mesh prefix dependency to the example (to maintain consistency, even though it will work without the dependency in the example since the dependency is installed in the auto-pagination example)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 491605e

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