Added a CHANGELOG

Author: Radonirinaunimi

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
+
+- Added `NNLOJET` install helper and pinecard generation
+- Added `--finalize` and `--dry` CLI flags
+- Added tutorials on `PineAPPL` conversion using Nix
+
+### Changed
+
+- Updated `PineAPPL` to version v1
+- Updated MG5 interface to version 3.6.5
+- Updated `Yadism` to version 0.13.7
+- Updated multiple pre-commit configurations
+- Reworked MG5 cut configuration using JSON and dictionary-based defaults
+- Updated linting and CI setup
+
+### Fixed
+
+- Fixed CKM running
+- Fixed MG5 cut definitions and variable naming errors
+- Fixed repository URL in `pyproject.toml`
+
+### Internal / Maintenance
+
+- Added `integrability v1` and updated positivity tests
+- Changed behavior to fail when no pinecard is found
+- Whitelisted `PineAPPL` for pylint and re-enabled checks
+- General cleanup and minor stylistic fixes
+
+---