add autolink test

osu.Game.Tests/Visual/UserInterface/TestSceneOsuMarkdownContainer.cs

@@ -95,6 +95,15 @@ _**italic with underscore, bold with asterisk**_";
             });
         }
 
+        [Test]
+        public void TestAutoLink()
+        {
+            AddStep("Add autolink", () =>
+            {
+                markdownContainer.Text = "<https://discord.gg/ppy>";
+            });
+        }
+
         [Test]
         public void TestInlineCode()
         {