chore: cargo workspace with citygen and city crates

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/city/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "city"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "city"
+path = "src/main.rs"
+
+[dependencies]
+citygen = { path = "../citygen" }
+serde.workspace = true
+postcard.workspace = true
+serde_json.workspace = true
+anyhow.workspace = true
+ratatui.workspace = true
+crossterm.workspace = true
+clap.workspace = true
+ron.workspace = true
+
+[dev-dependencies]
+unicode-width.workspace = true

crates/city/src/main.rs

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