Privacy-focused P2P file-sharing networks and systems.md

Below is a list of, selected, privacy-focused P2P file-sharing systems and networks, with a link to their GitHub repositories:

1. Kademlia: GitHub link
2. IPFS & IPLD IPFS GitHub link and IPLD GitHub link)
3. Substratum: GitHub link
4. Syncthing: GitHub link
5. BigChainDB: GitHub link
6. Tahoe-LAFS: GitHub link
7. Urbit: GitHub link
8. DAT: GitHub link
9. Git: GitHub link