docs: Add initial release notes for v1.0.0.

RELEASE_NOTES.md

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+# FastMemos v1.0.0
+
+🎉 **Initial Release**
+
+A lightweight macOS menubar app for quickly capturing notes to your self-hosted Memos instance.
+
+## ✨ Features
+
+- **Menubar Integration** - Lives in your menubar, always accessible
+- **Global Shortcut** - Press `⌘⇧M` anywhere to capture a thought
+- **Liquid Glass UI** - Beautiful macOS 26 native glass design
+- **Instant Sync** - `⌘Enter` to push notes to your Memos server
+- **Secure Storage** - Credentials stored in macOS Keychain
+- **Visibility Control** - Set default visibility + override per memo
+- **Real-time Stats** - Live character and word count
+
+## 📋 Requirements
+
+- macOS 26.0 (Tahoe) or later
+- Self-hosted [Memos](https://github.com/usememos/memos) instance
+
+## 📦 Installation
+
+1. Download `FastMemos-1.0.0.zip`
+2. Unzip and drag `FastMemos.app` to your Applications folder
+3. Launch FastMemos and configure your Memos server in Settings
+
+## ⌨️ Keyboard Shortcuts
+
+| Action | Shortcut |
+|--------|----------|
+| Open note window | `⌘⇧M` |
+| Submit note | `⌘Enter` |
+| Close window | `Escape` |
+
+## 🔐 Privacy
+
+- Credentials stored securely in macOS Keychain
+- Notes sent directly to YOUR server
+- No analytics, tracking, or telemetry
+
+---
+
+**Full Changelog**: https://github.com/pawelorzech/FastMemos/commits/v1.0.0