Add Minecraft Classic ProtoDefc file

[ghost]

A quick start:

@type integer("i8") def_native("i8");
@type integer("u8") def_native("u8");
@type integer("i16") def_native("i16");
def_native("byte_array");
def_native("string");

namespace("to_server") {
  def("packet_player_identification") => container {
    field("protocol_version") => ::u8;
    field("username") => ::string;
    field("verification_key") => ::string;
    field("unused") => ::i8;
  };

  @export "to_server_packet"
  def("packet") => container {
    virtual_field("tag", value: "data/@tag") => ::u8;
    field("data") => union("to_server", tag: "../tag") {
      variant("player_identification", match: "0") => packet_player_identification;
    };
  };
};

[rom1504]

Maybe you can run hansihe json -> pds converter to bootstrap this ?