Add another example application

This new step sets the headerbar as titlebar, and enables
fallback for the app menu.

examples/application10/main.c

@@ -0,0 +1,15 @@
+#include <gtk/gtk.h>
+#include <exampleapp.h>
+
+int
+main (int argc, char *argv[])
+{
+  /* Since this example is running uninstalled,
+   * we have to help it find its schema. This
+   * is *not* necessary in properly installed
+   * application.
+   */
+  g_setenv ("GSETTINGS_SCHEMA_DIR", ".", FALSE);
+
+  return g_application_run (G_APPLICATION (example_app_new ()), argc, argv);
+}