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).
+
+## Unreleased
+
+### Added
+
+- Added support for command-line parameters to scripts
+
+  These can be accessed as a vararg in the root of a script:
+
+  ```lua
+  local firstArg: string, secondArg: string = ...
+  print(firstArg, secondArg)
+  ```
+
+- Added CLI parameters for downloading type definitions:
+
+  - `lune --download-selene-types` to download Selene types to the current directory
+  - `lune --download-luau-types` to download Luau types to the current directory
+
+  These files will be downloaded as `lune.yml` and `luneTypes.d.luau`
+  respectively and are also available in each release on GitHub.
+
+## `0.0.1` - January 19th, 2023
+
+Initial Release