Add a readme for the web demo

dannystaple · dannystaple · commit 5808a6cf2292 · 2022-07-20T18:05:00.000+01:00
diff --git a/demos/web_arm/README.md b/demos/web_arm/README.md
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+# Web Control USB Arm Demo
+
+This demonstration code shows how to use this library with the Maplin/OWI edge USB robot arm to control it over the web via a browser.
+
+Install flask (with pip3 install flask) and follow along with the video at <https://youtu.be/wqt1u-WdOxY>.
