feat: scaffold Rust/GTK4 project

src/main.rs

@@ -0,0 +1,21 @@
+use gtk::prelude::*;
+use gtk::{glib, Application, ApplicationWindow};
+
+const APP_ID: &str = "dev.rootiest.IconColorTool";
+
+fn main() -> glib::ExitCode {
+    let app = Application::builder().application_id(APP_ID).build();
+
+    app.connect_activate(|app| {
+        let window = ApplicationWindow::builder()
+            .application(app)
+            .title("Icon Color Tool")
+            .default_width(900)
+            .default_height(650)
+            .build();
+
+        window.present();
+    });
+
+    app.run()
+}