[mvantellingen]

Adds READMEs for the core, express-adapter and fastify-adapter packages (description, install, requirements, usage checked against src, configuration, development, release, license) and links the packages from the root README, which also gets development/release/license sections.

[changeset-bot]

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Latest commit: fcefe0c

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.

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