added ags essentials

packages/ags/custom/app.ts

@@ -0,0 +1,10 @@
+import { App } from "astal/gtk3"
+import style from "./style.scss"
+import Bar from "./widget/Bar"
+
+App.start({
+    css: style,
+    main() {
+        App.get_monitors().map(Bar)
+    },
+})