Build a sample dApp that uses the PDS

[windley]

Build a sample dApp that shows how the PDS works. For now, let's imagine it as a photo sharing application.

Story: As a photographer, I want to be able to store, manage, and share my pictures while maintaining control of them in a data store, I control.

Requirements:

1. Application is just Javascript (strong preference for React) and can be hosted anywhere.
2. After initial launch, the application is given an ECI for a user's root pico that has appropriate permissions
3. The pico installs the photo sharing ruleset
4. The user can upload and delete photographs.
5. Photographs can be grouped into folders
6. Folders are private by default but can be make public.

To demonstrate the loose coupling of the dApp and the PDS, the application should launchable from the user's file system or a web server and behave the same.

[vmoreno02]

Features to implement:

• delete photo (Helaman)
• add photo via upload from file system (Helaman)
• make a photo private or public (Helaman)
• grant or remove access to a webid (Helaman)
• download file (Victoria)
• copy file (Helaman)

Done:

• attach pod
• detach pod
• dynamically list contents of folder
• enter folders
• add photos via URL
• create folder
• delete folder
• search for photo