Added 12 new AI tools

https://github.com/ArshdeepGrover/ai-tools-manager/pull/23

Added 12 new free AI tools across multiple categories to help students, designers, and developers.

Tool Name: 12 tools - QuillBot, Scribbr Citation Generator, Hemingway App, Elicit, KREA AI, StockImg AI, Stable Diffusion, Blackbox, Veed, Leonardo, Pika, Taskade) Category: AI Writing & Content, AI Design & Images, AI Coding & Development, AI Video & Audio, AI Productivity Why it's valuable: This expands AI Tools Hub with a diverse set of free and student-friendly tools. Free tier confirmed: Yes

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