Added a CHANGELOG.md and CONTRIBUTING.md documentation

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).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Removed
+
+## v1.0.0
+
+### Added
+
+- Initial versioning release
+
+### Changed
+
+### Removed

CONTRIBUTING.md

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+# Developer guidelines
+
+## Versioning and changelogging
+
+Packages in this repository must be versioned using [PVP][pvp] for Haskell and
+PureScript packages, and [Semantic Versioning 2.0.0][semver] for other languages.
+
+Most importantly, minor and patch changes must not include any breaking changes:
+no entity is removed, and there's no change in type definitions and functionality
+of preexisting exported entities. If any of this occurs, a major version must be
+bumped. Disregarding this rule can end up in breaking client package updates.
+
+Any changes must be logged in `CHANGELOG.md`, which must comply with [Keep A
+Changelog](https://keepachangelog.com/en/1.1.0/) requirements. Each entry should
+also provide a link to the GitHub issue and/or Pull Request that corresponds to
+the entry.
+
+An example entry is below:
+
+```lang-none
+* Something is fixed
+  [#123](https://github.com/mlabs/lambda-buffers/issues/123)
+```
+
+## Acknowledgements
+
+This document was adapted from [tx-village
+`CONTRIBUTING.md`](https://github.com/mlabs-haskell/tx-village/blob/main/CONTRIBUTING.md)'s.
+This is a living document that may change and grow to meet the project's needs
+
+[pvp]: https://pvp.haskell.org/
+[semver]: https://semver.org/