Add "Open with Codeanywhere" badge to README.md

[nibzard]

Why?

With Codeanywhere, devs and contributors can:

• Instantly launch a cloud or local IDE with remote dev environment.
• Automatically set up and configure a remote dev environments if a devcontainer.json file is present.

Benefits:

1. Faster onboarding for new contributors.
2. Consistent and ready-to-use development environments.
3. Flexibility to work in the cloud or locally.

[netlify]

✅ Deploy Preview for testcontainers-node ready!

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[cristianrgreco]

There is already a badge for GitHub Codespaces at the top of the README that gives all the same benefits.