Add IPNS Record (#312)

Author: lidel

table.csv

@@ -133,6 +133,7 @@ swhid-1-snp,                    ipld,           0x01f0,         draft,     SoftW
 json,                           ipld,           0x0200,         permanent, JSON (UTF-8-encoded)
 messagepack,                    serialization,  0x0201,         draft,     MessagePack
 car,                            serialization,  0x0202,         draft,     Content Addressable aRchive (CAR)
+ipns-record,                    serialization,  0x0300,         permanent, Signed IPNS Record
 libp2p-peer-record,             libp2p,         0x0301,         permanent, libp2p peer record type
 libp2p-relay-rsvp,              libp2p,         0x0302,         permanent, libp2p relay reservation voucher
 memorytransport,                libp2p,         0x0309,         permanent, in memory transport for self-dialing and testing; arbitrary