Resolve "Creating Complete Admin Documentation"

This merge request adds complete Admin Module documentation for the eHRS frontend application in Markdown format, along with supporting screenshots.

The documentation provides step-by-step guidance covering:

1. System access and authentication, including login workflow, session handling, and logout procedure.
2. Admin Dashboard overview, explaining the layout, header section, role-based navigation tabs, and responsive behavior.
3. Detailed explanation of all Admin modules:
   • Manage Doctors (doctor directory, registration, updates, and availability)
   • Medical Camps (camp creation, scheduling, editing, and attendance tracking)
   • Medicines (inventory management, stock levels, expiry tracking, and add/edit actions)
   • Assign Roles (user search, role assignment, and permission handling)
   • Patient Profiles (patient search, medical history, visits, and vitals)
   • Staff Attendance (attendance tracking, filters, and status indicators)
4. Complete operational workflows, including end-to-end medical camp planning, execution, and post-camp activities.
5. Best practices, data entry guidelines, and security considerations.