add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.9.0
+
+- Initial 'public' release
+
+### Added
+
+- DEPENDENCY: warpgate
+- macro helpers for the following effects:
+    - Boost/Lower Trait
+    - Deflection
+    - Glow
+    - Hinder
+    - Hurry
+    - Lingering Damage
+    - Protection
+    - Shroud
+    - Smite
+    - Summon
+- API helpers:
+    - `createEffectDocument`
+    - `createMutationWithEffect`
+    - `defaultMutationOptions`
+    - `getActorFolderByPath`
+    - `getActorsInFolder`
+    - `runOnTargetOrSelectedTokens`