feat: add changelog

Author: NthTensor

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],
+and this project adheres to [Semantic Versioning].
+
+This project is currently in early [pre-release], and there may be arbitrary breaking changes between pre-release versions.
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.1.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[pre-release]: https://semver.org/spec/v2.0.0.html#spec-item-9
+
+## [Unreleased]
+
+### Added
+
+- `ThreadPool::claim_lease` method.
+- `shuttle` test suite and feature flag (temporarily disabled).
+
+### Changed
+
+- Rename `ThreadPool::as_worker` to `ThreadPool::with_worker`.
+- Make `Scope` public.
+- Make `Yield` public. 
+- Improved safety comments for `scope`.
+- Code format no longer requires nightly.
+
+### Removed
+
+- `loom` cfg flag and test suite.
+
+### Fixed 
+
+- Fixed some broken examples and doc-tests.
+- Various broken links, spelling mistakes, and indentations.
+- Documentation for `yield_now` and `yield_local`.
+
+## [1.0.0-alpha.2]
+
+This was the first usable build of forte, and is the start point for this change log. All subsequent changes are relative to this pre-release.
+
+## [1.0.0-alpha.1]
+
+The initial release of this library was intended only to claim the name on `crates.io`. It was still early in development and did not employ a change-log.