Add "BrowserGym Ecosystem" paper in the readme

[xhluca]

Description by Korbit AI

What change is being made?

Add a new BibTeX entry for the "BrowserGym Ecosystem" paper in the README, providing guidance on how to cite the framework alongside an example usage.

Why are these changes being made?

These changes are made to acknowledge the newly published "BrowserGym Ecosystem" paper, allowing users to properly attribute the work when using BrowserGym in their research, thus increasing the framework's visibility and ensuring accurate citation in academic publications.

Is this description stale? Ask me to generate a new description by commenting /korbit-generate-pr-description

[korbit-ai]

I've completed my review and didn't find any issues... but I did find this bear.

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