Added schema architecture for Smart Clinic

SmartClinicManagementSystem/schema-architecture.md

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+# Architecture summary
+
+This Spring Boot application uses both MVC and REST controllers. 
+
+Thymeleaf templates are used for the Admin and Doctor dashboards, while REST APIs serve all other modules. 
+
+The application interacts with two databases—MySQL (for patient, doctor, appointment, and admin data) and MongoDB (for prescriptions). 
+
+All controllers route requests through a common service layer, which in turn delegates to the appropriate repositories. MySQL uses JPA entities while MongoDB uses document models.
+
+# Numbered flow of data and control
+
+1. User accesses AdminDashboard or Appointment pages.
+2. The action is routed to the appropriate Thymeleaf or REST controller.
+3. The controller calls the service layer to fetch data to display or execute a user initiated operation
+4. The service layer deduces what data is required for the business logic and either accesses the MySQL repositories or 
+   MongoDB repositories as needed.
+5. Both the Mysql and MongDB repositories translate the data JPA queries to database queries (SQL for 
+   MySQL, and NOSQL for MongoDB) and executes them as database transactions on the actual databases using the database 
+   drivers 
+6. The database queries are executed on the entity models defined for the databases and the data is retrieved from 
+   the database
+7. Finally, the data traverses back up via each layer up to either the Thymleaf template where it is rendered as 
+   HTML or to the REST Controller where the data is served as JSON.