This PR adds the necessary image assets for the new image-text-to-image and image-text-to-video tasks.

Files added:
- image-text-to-image/image-text-to-image-input.jpeg (copied from image-to-image)
- image-text-to-image/image-text-to-image-output.png (copied from image-to-image)
- image-text-to-video/image-text-to-video-input.jpg (copied from image-to-video)
- image-text-to-video/image-text-to-video-output.gif (copied from text-to-video)

These assets demonstrate the multimodal nature of these tasks by combining examples from both text-only and image-only variants.