docs: add OnJoin changelog

Author: Alcheri

docs/CHANGELOG.md

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+# Changelog
+
+All notable changes to OnJoin are documented in this file.
+
+## Unreleased
+
+### Changed
+
+- Normalised README badges.
+- Set the package Python requirement to Python 3.10 or newer.
+
+## v1.1.0 - 2026-05-03
+
+### Added
+
+- Added remote OnJoin quote management.
+- Added configuration for maximum stored quotes and recent quote output.
+
+### Changed
+
+- Revised README installation and setup guidance.
+- Normalised Black configuration.
+- Ignored the local `Documents/` directory.
+
+### Fixed
+
+- Hardened OnJoin quote handling.
+
+## v1.0.0 - 2026-04-03
+
+### Added
+
+- Initial OnJoin plugin release for sending notices to users entering a channel.
+- Added CodeQL analysis workflow configuration.
+- Added CI badges and Python source header policy documentation.
+
+### Changed
+
+- Standardised GitHub support files and `.gitignore` entries.
+- Moved supporting project documentation into the `docs/` directory.
+- Updated the contribution agreement.
+- Stabilised Black linting and restricted Black checks to Python files.