To do - add demo scripts

[robmarkcole]

Add a folder with demo scripts showing the usage of the rest-server. Ideas include

• [ ] Script which takes an image, processes it, and generates an annotated jpg

• [ ] Script for exposing the image as mjpeg stream/posting over mqtt

[robmarkcole]

A demo processing on the rpicamera live feed would be nice. Modify -> https://github.com/robmarkcole/live-stream-face-detection

[robmarkcole]

Don't faff around with cameras, just do the simple upload UI from https://github.com/robmarkcole/coral-pi-rest-server/issues/18