[ADD] Test badge to readme

Author: hasan-ahani

README.md

@@ -3,6 +3,7 @@
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/hasan-ahani/filament-otp-input.svg?style=flat-square)](https://packagist.org/packages/hasan-ahani/filament-otp-input)
 [![Total Downloads](https://img.shields.io/packagist/dt/hasan-ahani/filament-otp-input.svg?style=flat-square)](https://packagist.org/packages/hasan-ahani/filament-otp-input)
 [![PHP from Packagist](https://img.shields.io/packagist/php-v/hasan-ahani/filament-otp-input?style=flat-square)](https://packagist.org/packages/hasan-ahani/filament-otp-input)
+![Tests](https://github.com/hasan-ahani/filament-otp-input/workflows/Tests/badge.svg?style=flat-square)
 [![License](https://img.shields.io/github/license/hasan-ahani/filament-otp-input?style=flat-square)](https://github.com/hasan-ahani/filament-otp-input/blob/main/LICENSE.md)
 
 ![Preview](https://raw.githubusercontent.com/hasan-ahani/filament-otp-input/master/preview.png)