iiif-zenodo: Proof of concept 2020

This is a quick experiment in how one can automatically generate a IIIF (https://iiif.io/) manifest for images stored on Zenodo. It has worked for a few tested examples but only as an initial proof of concept and has not had any detailed error managment added in. A working example of the code has been setup at: https://cima.ng-london.org.uk/zenodo/ - if a Zenodo ID, for an image, is added to the end of the URL, such as: https://cima.ng-london.org.uk/zenodo/3758523 a simple image manifest will be returned.

See: example manifest - https://github.com/jpadfield/iiif-zenodo/blob/main/example-manifest.json

The manifest can be loaded into any public IIIF viewer such as:
* https://mirador-dev.netlify.app/__tests__/integration/mirador/
* https://jpadfield.github.io/simple-mirador/Standard%20Example.html