Add template for Editor tests

Author: antja0

Tests/Editor/Unity.com.3d-group.{{REPOSITORY_NAME}}.EditorTests.asmdef

@@ -0,0 +1,11 @@
+{
+  "name": "Unity.com.3d-group.{{REPOSITORY_NAME}}.Editor.Tests",
+  "references": [
+    "Unity.com.3d-group.{{REPOSITORY_NAME}}"
+  ],
+  "optionalUnityReferences": [
+    "TestAssemblies"
+  ],
+  "includePlatforms": [],
+  "excludePlatforms": []
+}

Tests/Editor/{{FRIENDLY_NAME}}EditorTests.cs

@@ -0,0 +1,34 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.TestTools;
+using UnityEngine.UI;
+
+namespace Tests.Runtime
+{
+    public class {{FRIENDLY_NAME}}Tests
+    {
+        [SetUp]
+        public void Setup()
+        {
+        }
+
+        [TearDown]
+        public void Teardown()
+        {
+        }
+
+        [UnityTest]
+        public void TestMethod_TestingHow_TestResult()
+        {
+            // Arrange
+
+            // Act
+            yield return null;
+
+            // Assert
+            Assert.AreEqual(1, 1);
+        }
+    }
+}