give me a mockup A quirky t-shirt design featuring a cute, relaxed cat sitting next to an open book. The cat is playfully playing with the book, with his eyes half-closed in a lazy, contented pose. The design should have a warm, humorous feel with the quote 'That's What I Do I Pet Cats. I Read Books And I Know Things' prominently displayed in a simple, elegant font. The text should be easy to read, integrated into the design in bold, playful type. Use bright, warm colours to create a friendly and inviting atmosphere. The overall look should be fun, light-hearted and perfect for cat lovers who love to read.