Add screenshot of nodes to the readme

Author: ewels

README.md

@@ -10,6 +10,8 @@ A Node-RED node for interacting with the Seqera Platform API.
 
 Gives new Node-RED node types for your automation workflows, which are designed to work together:
 
+<img src="https://github.com/ewels/node-red-contrib-seqera/raw/main/images/nodes.png" alt="node-red-contrib-seqera nodes" align="right">
+
 - [Create Dataset](#create-dataset)
 - [Launch and Monitor a Run](#launch-and-monitor-a-run)