chore: added a badge to the github workflow

[sashaphmn]

Changes

• Linear: https://linear.app/thirdweb/issue/INF-171/
• Here is the problem being solved.
• Here are the changes made.

How this PR will be tested

• Open the dashboard and click X. Result: A modal should appear.
• Call the /foo/bar API. Result: Returns 200 with "baz" in the response body.

Output

(Example: Screenshot/GIF for UI changes, cURL output for API changes)

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PR-Codex overview

This PR adds a new badge to the README.md file that indicates the build status of the project, enhancing visibility regarding the project's stability and ongoing development.

Detailed summary

• Added a build status badge linked to the GitHub Actions workflow in the README.md file.

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[github-actions]

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