add Reader and Writer interface of go-mc/net

net/interface.go

@@ -0,0 +1,16 @@
+package net
+
+import pk "github.com/Tnze/go-mc/net/packet"
+
+type Writer interface {
+	WritePacket(p pk.Packet) error
+}
+
+type Reader interface {
+	ReadPacket() (pk.Packet, error)
+}
+
+type ReaderWriter interface {
+	Reader
+	Writer
+}