Add initial server implementation

This adventure is going to be epic, be ready.

board-network/Cargo.toml

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+[package]
+name = "board-network"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.152", features = ["derive"] }
+board-shared = { path = "../board-shared" }

board-network/src/lib.rs

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+pub mod protocol;

board-network/src/protocol.rs

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+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub enum ClientMessage {
+    CreateRoom(String),
+    JoinRoom(String, String),
+    Disconnected,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub enum ServerMessage {
+    JoinedRoom {
+        room_name: String,
+    },
+}