Add CHANGELOG.md

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CHANGELOG.md

+# 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Conversion methods to construct a TileMatcher or TileLayout from any arbitrarily sized data array. This supports
+both any-lengthed arrays (Though the methods will fail for non-square lengths), and any internal type that can be
+converted to a Tile ID
+
+### Changed
+
+- **[BREAKING]** Swapped parameters of `TileMatcher::single` and `TileMatcher::single_match`, for better semantics
+  - `::single` Now expects one pre-configured rule
+  - `::single_match` Now expects a tile ID that will be converted to an exact match rule
+- **[BREAKING]** `TileLayout` and `TileMatcher` now internally use a 7x7 grid instead of 3x3. This change
+is only breaking if you directly accessed the internally stored data grid, or constructed an instance directly
+without using one of the constructor methods
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