Add CHANGELOG.md

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - 2024-11-01
+
+### Added
+
+- This `CHANGELOG.md` file.
+- Structured logging with `structlog`
+  - Readable `ConsoleRenderer` for local development
+  - `JSONRenderer` for production logging
+- Request-Id Middleware with `asgi-correlation-id`
+- Expanded README.md with more comprehensive instructions for installation & usage
+  - Repository-wide improved documentation details, comments
+- CodeSpell exceptions in VSCode workspace settings
+
+### Changed
+
+- Switched from `hypercorn` to `uvicorn` for ASGI runtime
+- Switched to direct module 'serve' command in `backend/run.sh` & `backend/railway.json`
+- Relocated `.tool-versions` to project root
+- Massively overhauled run.sh scripts, mostly for backend service
+- Improved environment variable access in logging setup
+- Root logger now adheres to the same format as the rest of the application
+- Hide IP list when error occurs on client
+- `run.sh` passes through all arguments, e.g. bpython REPL via `./run.sh repl`
+- Use UTC timezone for timestamps, localize human readable strings, fixing 4 hour offset issue
+- `is_development` available globally from `utilities` module
+
+### Removed
+
+- Deprecated `startup` and `shutdown` events
+- Development-only randomized IP address pool for testing