docs: add release notes template

Author: kaolayu

.github/RELEASE_TEMPLATE.md

@@ -0,0 +1,39 @@
+# Release Notes Template
+
+## v2.0.0 - Major Release
+
+### 🎉 Highlights
+
+- Complete TypeScript rewrite with full type safety
+- Zero dependencies - lightweight and fast
+- Modern ESM + CommonJS dual package support
+
+### ✨ Features
+
+- **Expression Engine**: Parse and evaluate complex mathematical expressions with RPN conversion
+- **Battle System**: Built-in RPG battle simulation with character attributes and damage calculation
+- **Math Utilities**: Vector operations (dot, cross, distance), interpolation, and more
+- **Event System**: Flexible event-driven architecture for game logic
+- **Player System**: Complete character attribute management and combat mechanics
+
+### 📦 Installation
+
+```bash
+npm install @soonfx/engine@2.0.0
+```
+
+### 🔧 Breaking Changes
+
+- Package renamed from `@soonfx/fx` to `@soonfx/engine`
+- API restructured for better tree-shaking support
+
+### 📚 Documentation
+
+- [README](https://github.com/soonfx-engine/core#readme)
+- [Online Demo](https://soonfx.dev)
+- [Examples](https://github.com/soonfx-engine/core/tree/main/examples)
+
+---
+
+**Full Changelog**: https://github.com/soonfx-engine/core/commits/v2.0.0
+