add blitz files

include/blitz/protocol/PacketSerializer.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <blitz/protocol/Packets.h>
+#include <godot_cpp/variant/packed_byte_array.hpp>
+#include <memory>
+
+namespace blitz {
+namespace protocol {
+
+using PacketPtr = std::unique_ptr<Packet>;
+
+namespace PacketSerializer {
+
+godot::PackedByteArray Serialize(const Packet& a_Packet);
+
+std::unique_ptr<Packet> Deserialize(godot::PackedByteArray& a_Data);
+
+}
+}  // namespace protocol
+}  // namespace blitz