read.me update
read.me update

file:a/README.md -> file:b/README.md
--- a/README.md
+++ b/README.md
@@ -8,3 +8,9 @@
 
     npm install node-red-contrib-onvif
 
+## Usage
+
+ONVIF Snapshot returns msg.payload in the form of a base64 encoded image to use with a Node-RED Dashboard template
+
+    <img src="{{ msg.payload }}">
+

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