Implement contact management API

Closes #58, #57, #56, #45, and #4

See merge request !24

Implement file management API

Closes #55, #54, #53, #52, and #51

See merge request !28

Add unit tests for AuthManager

See merge request !27

Add API docs

See merge request !31

added README

See merge request !17

Use different Tor ports than Briar

Closes #34

See merge request !26

Create base IntegrationTest; move Contact; add Jackson

See merge request !29

for getting random IDs, contacts and for mocking database transactions

Basic API prototype with authentication

See merge request !14

this also stubs a FileManager to show how authorization in the route endpoints could look like

Factor our authentication function from AuthenticationPipeline to prevent confusion about annotated returns from lambda

Add a simple RandomIdManager to generate and validate random IDs

Closes #44

See merge request !25

Some code cleanup

See merge request !23

Store private key of hidden service

Closes #46

See merge request !21