feat: add changelogs

Author: gadomski

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]
+
+## [0.1.0] - 2024-10-08
+
+Initial release.
+
+[Unreleased]: https://github.com/developmentseed/cql-rs/compare/v0.1.0...main
+[0.1.0]: https://github.com/developmentseed/cql-rs/releases/tag/v0.1.0

RELEASING.md

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+# Releasing
+
+Setup:
+
+- Install [cargo-release](https://github.com/crate-ci/cargo-release): `cargo install cargo-release`
+
+Then:
+
+1. Create a new branch: `release/vX.Y.Z`
+2. Update the versions all `Cargo.toml` files, as necessary
+3. Update each README 
+4. Update each CHANGELOG
+5. Open a PR
+6. Once approved, merge the PR
+7. (if releasing the main crate) Run `cargo release -p cql2`, then `cargo release -p cql2 --execute`
+8. (if releasing the cli crate) run `cargo release -p cql2-cli`, then `cargo release -p cql2-cli --execute`

cli/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]
+
+## [0.1.0] - 2024-10-08
+
+Initial release.
+
+[Unreleased]: https://github.com/developmentseed/cql-rs/compare/v0.1.0...main
+[0.1.0]: https://github.com/developmentseed/cql-rs/releases/tag/v0.1.0