Add demo to readme

README.md

@@ -11,7 +11,13 @@ If you're looking for a well-tested and maintained alternative to Qtile's defaul
 
 ## About
 
-Plasma works on a tree structure. Each tree node represents a container whose children are aligned either horizontally or vertically (similar to [i3](https://i3wm.org/)). Each window is attached to a leaf of the tree and takes either a calculated relative amount or a custom absolute amount of space in its parent container. Windows can be resized, rearranged and seamlessly integrated into other containers, enabling lots of different setups.
+Plasma works on a tree structure. Each node represents a container with child containers aligned either horizontally or vertically (similar to [i3](https://i3wm.org/)). Each window is attached to a leaf, taking either a calculated amount or a custom amount of space in its parent container. Windows can be resized, rearranged and integrated into other containers, enabling lots of different setups.
+
+## Demo
+
+Here is a quick demo showing some of the main features (adding modes, moving, integrating and resizing):
+
+![Demo](https://i.imgur.com/y1cTsK8.gif)
 
 ## Installation