Create and populate discovery & routing section

[salmad3]

Done Criteria

• Initiate overview doc on peer discovery
• Initiate protocol docs for:
  • Rendezvous
  • mDNS
  • GossipSub
  • Kad-DHT

Why Important

• Provides material on how peers discover and announce services to other peers.
• Documents protocols not yet documented.

Notes

Populating the docs to be tracked in other issues.

Would follow a structure similar to the other sections, such as:

• What is Peer Discovery
• Rendezvous
• mDNS
• GossipSub
• Kad-DHT