Added some message types, removed protocolbuffer dependency and added msgpack dependency

dub.json

@@ -3,8 +3,11 @@
 		"Tristan B. Kildaire"
 	],
 	"copyright": "Copyright © 2021, Tristan B. Kildaire",
+	"dependencies": {
+		"msgpack-d": "~>1.0.3"
+	},
 	"description": "Client-side DNET API",
 	"license": "LGPLv2",
 	"name": "libdnet",
 	"targetType": "library"
-}
+}

source/libdnet/types.d

@@ -0,0 +1,77 @@
+/**
+* Type declarations
+*/
+module libdnet.types;
+
+import msgpack;
+
+/* TODO: Add structs here */
+
+
+public enum HeaderType
+{
+	CLIENT,
+	SERVER
+}
+
+/**
+* Header format
+*
+* [ messageType | payload ]
+*/
+struct Header
+{
+	/**
+	* Type of message
+	*
+	* How the `payload` should be
+	* interpreted
+	*/
+	HeaderType type;
+
+	/**
+	* Data of the message
+	*/
+	ubyte[] payload;
+}
+
+
+/**
+* Server message
+*
+* TODO: Describe message
+*/
+struct ServerMessage
+{
+	/* TODO: Populate */
+}
+
+
+/**
+* ClientType
+*
+* The type of ClientMessage
+*/
+public enum ClientType
+{
+	AUTH
+}
+
+/**
+* Client message
+*
+* TODO: Describe message
+*/
+struct ClientMessage
+{
+	/* TODO: Populate */
+	ClientType type;
+
+	ubyte[] payload;
+}
+
+struct AuthenticateMessage
+{
+	string username;
+	string password;
+}