Added CHANGELOG.md

Author: vmagnin

CHANGELOG.md

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+# Changelog
+All notable changes to the gtk-fortran project are documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [cairo-fortran dev] 2023
+
+### Added
+- `LICENSE_EXCEPTION`: text of the GCC RUNTIME LIBRARY EXCEPTION 3.1.
+- `CHANGELOG.md`
+
+### Changed
+- `src/cairo-auto.f90` and `src/cairo-enums.f90` updated for **Cairo 1.17.8** (generated with the `cfwrapper.py` program under Fedora 38).
+
+## [cairo-fortran 1.0.0]
+
+This repository was cloned in 2022 from a backup of the now unavailable @brocolis' repository, using the latest 5th September 2021 version.