Add changelog (#99)

Author: graycampbell

CHANGELOG.md

@@ -0,0 +1,18 @@
+# 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/swift-mocking/releases/tag/0.1.0) - April 23, 2025 ([Full Changelog](https://github.com/fetch-rewards/swift-mocking/commits/0.1.0))
+
+### 🚀 Initial Release
+
+This is the first public release of Swift Mocking, a library that provides a collection of Swift macros used to generate mocks.
+
+This initial release includes:
+
+- `@Mocked` - an attached peer macro that generates a mock class from a protocol declaration.
+- `@MockedMembers` - an attached member and member-attribute macro that generates mocked members for a mock declaration.
+- `@MockableProperty` - an attached macro that marks a property as being mockable.
+- `@MockableMethod` - an attached macro that marks a method as being mockable.