+ Information about ports required for i2p (inbound and outbound)
+ i2prouter (java) works with Bitcoin Core, so previous note is incorrect. Changed it with relevant information.
+ Rename Tor section to Privacy
+ Add i2p chapter in Privacy section
+ Change chapter numbers accordingly
+ Create `i2p_service.md`
+ Table for basic differences between Tor and i2p
+ Follow the same format for `15_0_Using_i2p.md` as used in Tor chapter
+ Add details in the steps used to create Bitcoin Core i2p service