Add links to and/or an overview of applications/demos that use the API

[ndkv]

Examples are Hallo Boer and @zoot-wur's demos (https://github.com/zoot-wur/api-v1-samples/tree/patch-1/html).

[robknapen]

@zoot-wur's demo has been merged into the repo: api-v1-samples/html/adcMultiViewer.html