xo-imgui: + vulkan examples

xo-imgui/example/ex4/imgui_ex4.cpp

@@ -0,0 +1,19 @@
+/* imgui_ex4.cpp */
+
+#include "xo/imgui/VulkanApp.hpp"
+#include <iostream>
+
+int main() {
+    VulkanApp app;
+
+    try {
+        app.run();
+    } catch (const std::exception& e) {
+        std::cerr << e.what() << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    return EXIT_SUCCESS;
+}
+
+/* end imgui_ex4.cpp */