[FEATURE] Add tests badge

[guibranco]

Description
To improve our project’s visibility and credibility, we should add a tests badge to the README file. This badge will provide a quick overview of the current test status and indicate whether our tests are passing or failing.

Requirements

• Determine the appropriate badge service to use (e.g., Shields.io or another service).
• Update the README file to include the tests badge in a visible location, ideally near other status badges (like build status or coverage).

Acceptance Criteria

• The tests badge is displayed correctly in the README file.
• The badge accurately reflects the current status of our tests (passing or failing).
• The badge links to the detailed test report or testing framework, if applicable.

Additional Context
Refer to the relevant documentation of the badge service to understand how to generate the badge link and integrate it into the README.

[gitauto-ai]

@guibranco Pull request completed! Check it out here #65 🚀

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