Update workflow to latest standards + add test projects (#102)

* Move test-project to subfolder

* Update workflow to target test-project

* Add 2018.3-legacy test-project

* Rename to legacy-render-pipeline

* Add test project for URP

* Cache LFS

* Update license

* Ignore artifacts

* Add test project for HDRP

* Avoid ambiguity in cache key

test-projects/test-project/Assets/Tests/EditMode/SampleEditModeTest.cs

@@ -0,0 +1,38 @@
+using System.Collections;
+using System.Collections.Generic;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+namespace Tests
+{
+  public class SampleEditModeTest
+  {
+    [Test]
+    public void TestIncrement()
+    {
+      // Given
+      var counter = new BasicCounter(0);
+
+      // When
+      counter.Increment();
+
+      // Then
+      Assert.AreEqual(1, counter.Count);
+    }
+
+    [Test]
+    public void TestMaxCount()
+    {
+      // Given
+      var counter = new BasicCounter(BasicCounter.MaxCount);
+
+      // When
+      counter.Increment();
+
+      // Then
+      Assert.AreEqual(BasicCounter.MaxCount, counter.Count);
+    }
+
+  }
+}