Add changelog (#62)

Signed-off-by: Gray Campbell <[email protected]>

Author: graycampbell

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file. 
+
+This project adheres to [Semantic Versioning](https://semver.org).
+
+## 📦 [Version 0.1.0](https://github.com/fetch-rewards/SwiftSyntaxSugar/releases/tag/0.1.0) - April 21, 2025 ([Full Changelog](https://github.com/fetch-rewards/SwiftSyntaxSugar/commits/0.1.0))
+
+### 🚀 Initial Release
+
+This is the first public release of `SwiftSyntaxSugar`, a library that extends and simplifies interaction with [`SwiftSyntax`](https://github.com/swiftlang/swift-syntax),
+aiming to reduce boilerplate and improve ergonomics for developers building Swift tooling.
+
+This initial release includes:
+
+- Expressive syntax that improves the ergonomics of working with `SwiftSyntax` types
+- Powerful, convenient extensions that reduce boilerplate when parsing Swift syntax trees
+- A well-tested foundation on which to build Swift tooling