📚 Add screenshot and logo

README.md

@@ -26,6 +26,8 @@ BookStack is a simple, self-hosted, easy-to-use platform for organising and
 storing information.  Please support the developers of this software at
 [Bookstack].
 
+![Bookstack screenshot](images/screenshot.gif)
+
 ## Installation
 
 The installation of this add-on is pretty straightforward and not different in

bookstack/.README.j2

@@ -15,6 +15,8 @@ storing information.
 
 [Click here for the full documentation][docs]
 
+![Bookstack screenshot][screenshot]
+
 {% if channel == "edge" %}
 ## WARNING! THIS IS AN EDGE VERSION!
 
@@ -65,3 +67,4 @@ If you are more interested in stable releases of our add-ons:
 [project-stage-shield]: https://img.shields.io/badge/project%20stage-experimental-yellow.svg
 [release-shield]: https://img.shields.io/badge/version-{{ version }}-blue.svg
 [release]: {{ repo }}/tree/{{ version }}
+[screenshot]: https://github.com/hassio-addons/addon-bookstack/raw/master/images/screenshot.gif