chore: first project structure

crates/lanparty-relay/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "lanparty-relay"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]

crates/lanparty-relay/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}