docs: add Turkish (TR) translation of README

[oguzserdar]

Changes

✨ Added complete Turkish (TR) translation that:

• Maintains original document structure and layout
• Preserves all formatting, emojis, and technical terms
• Retains all original links and image references
• Includes full translation of all sections (Features, Use Cases, Quick Start, etc.)
• Updates language selector in Translations section

Purpose

🌍 This translation is part of our internationalization efforts to make Eliza more accessible to Turkish-speaking developers.