Add comprehensive TTS model documentation and research
Added detailed documentation for 10 TTS models:
- Coqui TTS (XTTS-v2): High-quality multilingual with voice cloning
- Mozilla TTS: Historical context, superseded by Coqui
- Piper TTS: Fast, lightweight, 100+ voices
- Chatterbox: Emotion control, 23 languages
- Mimic 3: Privacy-focused, offline capable
- eSpeak NG: 100+ languages, accessibility-focused
- Kokoro TTS: Fast decoder-only architecture
- Tortoise TTS: Studio-quality but slow
- Step-Audio-EditX: Experimental LLM-based audio editing
- Maya1: Indic languages specialist
Created comprehensive research overview:
- Complete model comparison matrix
- Performance characteristics and feature analysis
- License compatibility analysis
- Integration roadmap and priorities
- Raccoon Mission risk assessment
Updated MODELS.md:
- Added documentation index with links to all model docs
- Added research overview reference
- Added detailed doc references in existing sections
- Added "Additional Models Under Research" section
All documentation follows Raccoon Mission theme of rescuing
abandoned open-source TTS models for long-term preservation.
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