Allow phpunit.xml to be in version control

Author: CodeWithKyrian

.gitignore

@@ -2,7 +2,6 @@
 /.php-cs-fixer.cache
 /.php-cs-fixer.php
 /composer.lock
-/phpunit.xml
 /vendor/
 *.swp
 *.swo

phpunit.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+>
+    <testsuites>
+        <testsuite name="Test Suite">
+            <directory suffix=".php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <source>
+        <include>
+            <directory suffix=".php">./src</directory>
+        </include>
+    </source>
+</phpunit>