feat: adding test hello world

Assets/Tests/HelloWorld.cs

@@ -0,0 +1,25 @@
+using System.Collections;
+using System.Collections.Generic;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+public class HelloWorld
+{
+    // A Test behaves as an ordinary method
+    [Test]
+    public void HelloWorldSimplePasses()
+    {
+      Assert.True(true);
+    }
+
+    // A UnityTest behaves like a coroutine in Play Mode. In Edit Mode you can use
+    // `yield return null;` to skip a frame.
+    [UnityTest]
+    public IEnumerator HelloWorldWithEnumeratorPasses()
+    {
+        // Use the Assert class to test conditions.
+        // Use yield to skip a frame.
+        yield return null;
+    }
+}

Assets/Tests/Tests.asmdef

@@ -0,0 +1,6 @@
+{
+    "name": "Tests",
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ]
+}