Added 9 screenshots showing all dashboard views: dashboard overview,
certificates list, agents fleet, jobs queue, notifications inbox,
policies, issuers, targets, and audit trail. Screenshots are displayed
in a 2-column grid in the README.
Note: actual .png files need to be added to docs/screenshots/ — this
commit includes the README markup and directory placeholder.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
shankar0123