docs: add initial CHANGELOG for v0.1.0

Author: Antonio Maiolo

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.1.0] - 2025-12-10
+
+Initial open source release of Think - a local-first AI assistant with memory.
+
+### Features
+
+#### Core
+- Chat with AI using local Ollama or OpenAI-compatible cloud APIs
+- Real-time streaming responses with conversation history
+- RAG (Retrieval-Augmented Generation): AI uses your saved memories as context
+- Source attribution showing which memories informed each response
+
+#### Memory Management
+- Save web pages and manual notes
+- Hybrid search: semantic (vector embeddings) + full-text keyword search
+- Automatic AI-generated summaries and tags
+- Filter by type (web/note) and date range
+- Infinite scroll pagination
+
+#### Chrome Extension
+- One-click save of current webpage
+- Duplicate detection with update option
+- Secure native messaging (no HTTP exposure)
+
+#### AI Providers
+- **Local**: Ollama with automated setup wizard (llama3.2, nomic-embed-text)
+- **Cloud**: OpenAI or compatible APIs
+- Switch providers without losing data
+
+#### Privacy & Security
+- Local-first architecture - no data sent externally by default
+- Master password protection
+- Encrypted SQLite database
+- No telemetry or tracking
+
+#### UI/UX
+- Clean, modern interface
+- Light/dark theme support
+- Personalized greetings with user profile