Add Gtk app

main.js

@@ -0,0 +1,11 @@
+imports.gi.versions.Gtk = '3.0';
+
+const { Gst } = imports.gi;
+const { App } = imports.clapper_src.app;
+
+Gst.init(null);
+
+function main()
+{
+    let clapper = new App(arguments).run();
+}