Add a changelog (#130)

Author: jpschorr

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).
+
+## [Unreleased]
+
+### Added
+
+- Lexer & Parser for the majority of PartiQL query capabilities
+- AST for the currently parsed subset of PartiQL
+- Tracking of locations in source text for ASTs and Errors
+- Conformance tests via test generation from [partiql-tests](https://github.com/partiql/partiql-tests/)
+
+