Must have: Flesh out technological implementation

[berndkr]

Further describe the technological implementation:

• Look into open-source tools that we can use to help us in the implementation
• Give a high level overview of the required components for implementing the core features of the tool.

[qurben]

Maybe take a look at https://github.com/hypothesis/client

[qurben]

Also https://github.com/instructure/pdf-annotate.js/

[qurben]

Also https://github.com/RavishaHesh/PDFJsAnnotations