Add initial changelog for v1.0.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, which is a **cumulative record**.
+
+Each version entry follows a consistent structure with the following optional sections:
+
+- **Added** – New features
+- **Changed** – Modifications to existing functionality
+- **Deprecated** – Features marked for future removal
+- **Removed** – Features removed in this version
+- **Fixed** – Bug fixes
+- **Security** – Vulnerability fixes
+
+Format based on [Keep a Changelog](https://keepachangelog.com) and [Semantic Versioning](https://semver.org).
+
+
+## [1.0.0] - 2025-06-26
+### Added
+- Multi-format, multi-instrument file reading system for FAIR data processing
+- Data integration pipeline with YAML-based configuration for cross-project adaptability
+- Metadata revision and normalization pipeline
+- HDF5 manager object for data extraction, handling, and visualization