Add changelog for initial release in docs folder and prepare for rele…

…ase version 1.0.0

docs/CHANGELOG.md

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+# Changelog
+
+## [1.0.0] - 2025-01-05
+
+### Added
+
+- Initial release of WP Category Media.
+- Added functionality to upload and manage category images from the WordPress admin.
+- Added options for configuring image width and border radius for category images.
+- Integrated media uploader for adding/removing images.
+- Implemented the ability to display category images on the category archive page.
+- Display category images in a new column in the category management table.
+- Sortable column for category images in the admin category list.
+- Added shortcode to display categories and images on the front-end.
+
+### Fixed
+
+- Improved admin interface for adding and updating category images.
+- Fixed issues with category image display in the admin panel.