Add a p2p mini-hack

[zgramana]

As a mobile developer, I want to complete a 20-30 mini-hack so that I can quickly understand the central concepts and basic techniques required to build a Couchbase Mobile p2p app.

Requirements:

• Simple peer discovery and authentication mechanism.
• Demonstrate use of filter functions to only replicate a subset of data.
• Demonstrate simple throttling to limit replication to one sync peer at a time.