Add CHANGELOG

Author: adamgraham

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).
+
+## [0.1.0] - 2021/05/19
+
+### Added
+
+#### Materials
+
+- Grid 4x4 (20 color variants)
+- Checkerboard 2x2
+- Checkerboard 4x4
+- Cubemap Axes
+- Reflection
+
+#### Textures
+
+- Grid Emission 4x4
+- Checkerboard 2x2
+- Checkerboard 4x4
+- Cubemap Light/Dark
+- Cubemap Axes
+
+#### Prefabs
+
+- Grid Cube 1x1x1
+- Grid Plane 1x1x1
+- Grid Room 50x50x50
+- Checkerboard Cube 1x1x1
+- Reflection Sphere
+- Cubemap Axes
+
+#### Shaders
+
+- Checkerboard Lit
+- Checkerboard Unlit