add paragraph test

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

@@ -95,6 +95,19 @@ _**italic with underscore, bold with asterisk**_";
             });
         }
 
+        [Test]
+        public void TestParagraph()
+        {
+            AddStep("Add paragraph", () =>
+            {
+                markdownContainer.Text = @"first paragraph
+
+second paragraph
+
+third paragraph";
+            });
+        }
+
         [Test]
         public void TestFencedCodeBlock()
         {