adding a ss58 format for Stafi Network (#6347)

substrate/primitives/core/src/crypto.rs

@@ -470,6 +470,8 @@ ss58_address_format!(
 		(16, "kulupu", "Kulupu mainnet, standard account (*25519).")
 	DarwiniaAccount =>
 		(18, "darwinia", "Darwinia Chain mainnet, standard account (*25519).")
+	StafiAccount =>
+		(20, "stafi", "Stafi mainnet, standard account (*25519).")
 	RobonomicsAccount =>
 		(32, "robonomics", "Any Robonomics network standard account (*25519).")
 	CentrifugeAccount =>