Add Ajusta — AI Resume Optimizer Chrome Extension

[dippatel1994]

Adds Ajusta to a new Productivity section.

Ajusta is an AI-powered Chrome extension that optimizes resumes to match job descriptions, improving ATS compatibility and interview callback rates.

• Follows the contribution guidelines (format, description style, categorization)
• Creates a new Productivity category since the extension doesn't fit neatly into Developer or General