ADD readme.md to RxDB tanstackdb package

[pubkey]

🎯 Changes

Improve docs of the RxDB collection package by adding a readme to be shown on the npm page.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

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Latest commit: 82aa10b

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[pkg-pr-new]

More templates

• todos
• tanstack-start-example-basic
• @tanstack/db-example-paced-mutations-demo
• tanstack-start-db-projects-example
• @tanstack/db-example-react-todo
• offline-transactions-react-native
• @tanstack/db-example-solid-todo

@tanstack/angular-db

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@tanstack/query-db-collection

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@tanstack/react-db

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@tanstack/rxdb-db-collection

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@tanstack/solid-db

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@tanstack/svelte-db

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@tanstack/trailbase-db-collection

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@tanstack/vue-db

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commit: 82aa10b