Sweep: Add status badge for tests.yml GitHub workflow to README.md

[sweep-ai]

Purpose

This pull request adds a status badge for the tests.yml GitHub workflow to the project's README.md file. This will provide a visual indication of the current status of the project's test suite.

Description

The changes made in this pull request include:

• Adding a new status badge line to the README.md file, which displays the status of the tests.yml GitHub workflow.
• The new badge is placed alongside the existing badges for the Codacy code quality, CircleCI, and install.yml GitHub workflow.

Summary

• Added a new status badge for the tests.yml GitHub workflow to the README.md file.
• The new badge is placed alongside the existing badges for Codacy, CircleCI, and the install.yml GitHub workflow.

Fixes #765.

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[sweep-ai]

Sweep: PR Review

Author: sweep-ai[bot]
The Pull Request looks good! Sweep did not find any issues.