Update the readme

capability-check-node-red/readme.md

@@ -19,9 +19,13 @@ refer to [the Node-RED documentation](https://nodered.org/docs/creating-nodes/fi
 
 ## Docker
 
-A Docker container that already includes node-red as well as the capability-check node can be created executing the following command in this directory:
+A Docker image that already includes node-red as well as the capability-check node can be created executing the following command in this directory:
 `docker build -t capability-check-node-red -f Dockerfile ..`
 
+Pre-built images can be downloaded from the [Releases](https://github.com/VWS4LS/vws4ls-capability-matching/releases).
+
+After you have built/downloaded an image, perform `docker load -i <path-to-image.tar>` to load the image.
+
 ## Usage
 
 Once installed correctly, your Node-RED runtime should provide an addtional node called `capability-check` in the 'function' section.