feat: add cid package

cid/cid.go

@@ -0,0 +1,11 @@
+package cid
+
+import (
+	"github.com/multiformats/go-multibase"
+)
+
+func EncodeHashSimple(hash [32]byte) (string, error) {
+	prefixedHash := append([]byte{0x26, 0x1f}, hash[:]...)
+
+	return multibase.Encode(multibase.Base58BTC, prefixedHash)
+}