few more comments

src/main.cpp

@@ -81,16 +81,24 @@ class VulkanApp {
   }
 
  private:
+  // GLFW instance
   vkfw::UniqueInstance mVKFWInstance;
+  // GLFW window
   vkfw::UniqueWindow mWindow;
 
+  // Vulkan instance
   vk::UniqueInstance mInstance;
 
+  // Debug messenger
   vk::UniqueDebugUtilsMessengerEXT mDebugMessenger;
+  // Window surface
   vk::UniqueSurfaceKHR mSurface;
 
+  // Represents the physical device
   vk::PhysicalDevice mPhysicalDevice;
+  // Number of MSAA samples
   vk::SampleCountFlagBits mMsaaSamples;
+  // Represents the logical device
   vk::UniqueDevice mDevice;
 
   vk::Queue mGraphicsQueue;