docs: 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).
+
+## [0.1.0](https://github.com/alloy-rs/chains/releases/tag/v0.1.0) - 2023-11-14
+
+### Added
+
+- Initial release, forked from [`ethers_core::types::Chain`](https://github.com/gakonst/ethers-rs/blob/f97bb1db0e34727d7d74549bba5f6e246d760c13/ethers-core/src/types/chain.rs#L55) ([#2]) as `NamedChain` ([#3]), and [`reth_primitives::Chain`](https://github.com/paradigmxyz/reth/blob/8ecd90b884d1ae9cf9119a743b658a4a6dd110c1/crates/primitives/src/chain/mod.rs#L97) ([#4])
+
+### Changed
+
+- split Chain into a struct and ChainKind enum ([#5])
+
+[#2]: https://github.com/alloy-rs/chains/pull/2
+[#3]: https://github.com/alloy-rs/chains/pull/3
+[#4]: https://github.com/alloy-rs/chains/pull/4
+[#5]: https://github.com/alloy-rs/chains/pull/5