Added texture scrolling tutorial

docs/en/en.json

@@ -388,6 +388,11 @@
                 "description": "In this tutorial you will convert a shader from shadertoy.com to Defold.",
                 "image": "/tutorials/images/videos/shadertoy.png"
             },
+            {
+                "path": "/tutorials/textuire-scrolling",
+                "name": "Texture scrolling",
+                "description": "In this tutorial you will learn how to use a shader to scroll a repeating texture."
+            },
             {
                 "path": "/tutorials/runner",
                 "name": "Runner",