Anbarlı News XML v1.0.3

What's Changed

• Improved repository documentation and GitHub README positioning.
• Added WordPress readme keywords and clearer usage/troubleshooting sections.
• Added contributing guide, security policy, issue templates, PR template, and PHP syntax workflow.
• Aligned plugin text domain metadata with anbarli-news-xml.
• Included a clean installable ZIP package for the plugin.

Verification

• PHP syntax check passed with \php -l anbarli-news-xml.php.