Early gui impl, basic window management

xmpd-gui/src/windows/error.rs

@@ -0,0 +1,14 @@
+use super::Window;
+
+
+#[derive(Debug, Default)]
+pub struct ErrorW {
+
+}
+
+impl Window for ErrorW {
+    fn draw(&self, ui: &mut egui::Ui, state: &mut crate::GuiState) -> crate::Result<()> {
+        ui.label("Hello from other window!");
+        Ok(()) 
+    }
+}