Update Readme.md and add hero.png.

README.md

@@ -1,4 +1,8 @@
-[![Splide](images/splide.png)](https://splidejs.com/)
+<p align="center">
+  <a href="https://splidejs.com/" target="_blank">
+    <img src="images/hero.png">
+  </a>
+</p>
 
 **[Splide](https://splidejs.com/) is a lightweight, powerful and flexible slider and carousel, written in pure JavaScript without any dependencies.**