Move all crates into a crates directory (#1940)

crates/egui_demo_app/src/main.rs

@@ -0,0 +1,25 @@
+//! Demo app for egui
+
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+// When compiling natively:
+fn main() {
+    // Log to stdout (if you run with `RUST_LOG=debug`).
+    tracing_subscriber::fmt::init();
+
+    let options = eframe::NativeOptions {
+        drag_and_drop_support: true,
+
+        initial_window_size: Some([1280.0, 1024.0].into()),
+
+        #[cfg(feature = "wgpu")]
+        renderer: eframe::Renderer::Wgpu,
+
+        ..Default::default()
+    };
+    eframe::run_native(
+        "egui demo app",
+        options,
+        Box::new(|cc| Box::new(egui_demo_app::WrapApp::new(cc))),
+    );
+}