Add Sorena EU AI Act resources

[Ali-Razmjoo]

What are you adding or changing?

Adding Sorena EU AI Act resources for checklists, FRIA, conformity assessment, technical documentation, timeline guidance, and FAQ answers.

Checklist

• I have read CONTRIBUTING.md
• The link is publicly accessible and currently working
• The entry follows the format: - [Name](URL) — One-sentence description.
• The description is factual and under 100 characters (no marketing language)
• The resource is placed in the correct section
• The resource is not already listed in the README
• The resource is directly relevant to EU AI Act compliance or understanding