Added CHANGELOG.md

Author: jonasspinner

crates/modular-decomposition/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/).
+
+## [Unreleased]
+
+### Added
+
++ CI: check, test, fmt and clippy
++ CI: coverage reporting with Coveralls
++ `md_tree::ModuleIndex` is now `pub`
++ `md_tree::ModuleIndex` now has `new` and `index` methods to convert to and from `usize`
++ Changelog.md
+
+### Changed
+
++ Docs
++ `ModuleKind` and `MDTree` are now generic over `NodeId`. The output type of `modular_decomposition` is now dependent
+  on the `GraphBase::NodeId` type of the input graph.
+
+### Removed
+
++ `md_tree::NodeIndex` is now `pub(crate)` instead of `pub`
+
+## [0.1.0] - 2024-03-12
+
+### Added
+
++ Initial release
+
+[unreleased]: https://github.com/jonasspinner/modular-decomposition/compare/v0.1.0...HEAD
+
+[0.1.0]: https://github.com/jonasspinner/modular-decomposition/releases/tag/v0.1.0