Implement OpenGL from window-starter

The bulk of the work to create an OpenGL context on windows and load the some of the functions required to get a triangle rendering using modern OpenGL

src/platform/null_opengl.cpp

@@ -0,0 +1,25 @@
+#include "../opengl.h"
+
+namespace ogl_starter
+{
+class NullOpenGLImpl final : public OpenGL
+{
+public:
+	~NullOpenGLImpl() override = default;
+	NullOpenGLImpl(const NullOpenGLImpl&) = delete;
+	NullOpenGLImpl& operator=(const NullOpenGLImpl&) = delete;
+
+	NullOpenGLImpl(NullOpenGLImpl&&) = default;
+	NullOpenGLImpl& operator=(NullOpenGLImpl&&) = default;
+
+	void ClearBuffers() override {}
+	void SwapBuffers() override {}
+	void DrawScene() override {}
+};
+} // namespace ogl_starter
+
+std::unique_ptr<ogl_starter::Window> oglsCreateWindow(ogl_starter::OpenGLCreateParams)
+{
+	auto result = std::make_unique<ogl_starter::NullOpenGLImpl>();
+	return result;
+}