docs: add changelog for v1.0.0 release

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2024-02-13
+
+### Added
+- Initial release of LLM Doc Scraper
+- Web scraping functionality with BeautifulSoup
+- LLM-powered content summarization using OpenAI API
+- Streamlit UI for easy interaction
+- SQLite database for URL history
+- Customizable filename generation
+- Token counting with tiktoken
+- Database migration system
+- Model selection with persistence
+- OpenAI API key management
+- Progress tracking with duration display
+
+### Features
+- 🌐 Intelligent web scraping with link detection
+- 🤖 LLM-based content summarization
+- 📝 Clean markdown output format
+- 💾 Persistent URL history
+- 📁 Smart file organization
+- 🎯 Custom filename support
+- 🖥️ User-friendly interface
+- ⚡ Token counting and timing
+- 🔄 Database migrations
+- 🔑 Secure API key storage
+
+[1.0.0]: https://github.com/vialcollet/llm-doc-scraper/releases/tag/v1.0.0