add needed files

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

codec.go

@@ -0,0 +1,26 @@
+package drpc
+
+import (
+	"github.com/unistack-org/micro/v3/codec"
+	"storj.io/drpc"
+)
+
+type wrapMicroCodec struct{ codec.Codec }
+
+func (w *wrapMicroCodec) Marshal(v drpc.Message) ([]byte, error) {
+	if m, ok := v.(*codec.Frame); ok {
+		return m.Data, nil
+	}
+	return w.Codec.Marshal(v.(interface{}))
+}
+
+func (w *wrapMicroCodec) Unmarshal(d []byte, v drpc.Message) error {
+	if d == nil || v == nil {
+		return nil
+	}
+	if m, ok := v.(*codec.Frame); ok {
+		m.Data = d
+		return nil
+	}
+	return w.Codec.Unmarshal(d, v.(interface{}))
+}