chore: add core downloads to root README

[toddbaert]

See title.

I think this is a good idea since this is included in every other JS module and gives a good overall sense of our various JS SDKs' popularity.

[gemini-code-assist]

Summary of Changes

Hello @toddbaert, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new NPM download badge to the project's root README.md file. The badge visually displays the download count for the @openfeature/core package and provides a direct link to its NPM page, enhancing the discoverability and visibility of the package's adoption.

Highlights

• README Update: An NPM download badge for the @openfeature/core package has been added to the main README.md file.

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[gemini-code-assist]

Code Review

This pull request adds a useful NPM download count badge for the @openfeature/core package to the main README.md. My only suggestion is to use Markdown syntax for the new badge to keep it consistent with the other badges in the file, which will improve the document's readability and maintainability.