create basic OpenGL stuff

projects/apis/opengl/loader/opengl_instance_loader.c

@@ -0,0 +1,16 @@
+#include "opengl_loader.h"
+#include "instance/opengl_instance.h"
+
+gnInstanceFunctions loadOpenGLInstanceFunctions() {
+    return (gnInstanceFunctions){
+        ._gnCreateInstance = createOpenGLInstance,
+        ._gnDestroyInstance = destroyOpenGLInstance,
+        // ._gnGetPhysicalDevices = getMetalDevices,
+        // ._gnQueueCanPresentToSurface = metalCanQueuePresentToSurface,
+        // ._gnCreateOutputDevice = createMetalOutputDevice,
+        // ._gnDestroyOutputDevice = destroyMetalOutputDevice,
+        // ._gnCreateMacOSWindowSurface = createMetalSurface,
+        // ._gnDestroyWindowSurface = destroyMetalWindowSurface,
+        // ._gnGetSurfaceDetails = getMetalSurfaceDetails
+    };
+}