add dummy test

Author: ylebre

tests/dummyTest.php

@@ -0,0 +1,20 @@
+<?php
+/*
+    This file is here as an example and to make sure the github actions runner has a test to run.
+    It does not actually test anything.
+*/
+    
+namespace Pdsinterop\Dummy;
+
+use PHPUnit\Framework\TestCase;
+
+class DummyTest extends TestCase
+{
+    /**
+     * @coversNothing
+     */
+    public function testDummy(): void
+    {
+        $this->assertTrue(true);
+    }
+}