feat: Add Chinese (zh-CN) README translation

- Add comprehensive Chinese translation (README.zh-CN.md)
- Add language selector badges to both English and Chinese READMEs
- Mark translation as AI-generated with disclaimer
- Create GitHub issue #260 for community review and improvements

The Chinese translation makes Skill Seekers accessible to the massive
Chinese developer community. It's marked as machine-translated to set
expectations and invite community contributions for improvement.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -2,6 +2,8 @@
 
 # Skill Seeker
 
+English | [简体中文](README.zh-CN.md)
+
 [![Version](https://img.shields.io/badge/version-2.7.0-blue.svg)](https://github.com/yusufkaraaslan/Skill_Seekers/releases/tag/v2.7.0)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Python 3.10+](https://img.shields.io/badge/python-3.10+-blue.svg)](https://www.python.org/downloads/)