Add triangle rendering example with GLFW and surface support

[Copilot]

Adds a complete triangle rendering example using GLFW. The Device class now supports window surface creation through instance extension forwarding.

API Changes

Extended DeviceCreateInfo to accept instance extensions (e.g., GLFW surface extensions). When provided, automatically enables VK_KHR_swapchain device extension:

// Get GLFW required extensions
uint32_t count = 0;
const char** glfwExtensions = glfwGetRequiredInstanceExtensions(&count);
std::vector<const char*> extensions(glfwExtensions, glfwExtensions + count);

// Create device with surface support
RealEngine::DeviceCreateInfo createInfo {
    .AppName = "MyApp",
    .EnableValidationLayers = false,
    .RequiredExtensions = extensions,  // New field
};

RealEngine::Device device;
device.Create(createInfo);

// Create surface and swapchain
VkSurfaceKHR surface;
glfwCreateWindowSurface(device.GetInstance(), window, nullptr, &surface);

TriangleExample Implementation

• Complete self-contained example (~790 LOC)
• Embedded SPIR-V shaders (no external files)
• Swapchain creation and management
• Graphics pipeline with vertex colors
• Proper frame synchronization (semaphores/fences)
• Full resource cleanup

Build Configuration

• Added GLFW dependency to examples CMakeLists
• Updated README with GLFW installation and usage examples
• Note: Examples require Vulkan-capable GPU

The example renders a triangle with per-vertex RGB colors and demonstrates the complete RealRHI rendering pipeline from window creation through presentation.

Original prompt

Create an example that renders a simple triangle using glfw and RealRHI

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[Andthehand]

I want this to always have ValidationLayers enabled

Suggested change

	.EnableValidationLayers = false,
	.EnableValidationLayers = true,