Add information about roles in the system

docs/User Guide/User Roles.md

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+# User roles
+## Short overview
+|Role|Description|
+|----|-----------|
+|Admin|Kind of superuser in the system. Can manage system, resources, practitioners, etc.|
+|Receptionist|Can schedule/cancel appointments for the patient and manage their invoices.|
+|Practitioner|Can manage their own appointments, questionnaires, and patient care.|
+|Patient|Can see their own invoices and medical information related to them.|
+## Modules by role
+| Module         | Admin | Receptionist | Practitioner | Patient |URL|
+|---------------------|-|-|-------|--------------|--------------|---------|
+| Invoices            |   ✅   |       ✅      |       ❌      |    ✅    |https://emr.beda.software/invoices|
+| [Services](HealthcareServiceManagement)            |   ✅   |       ❌      |       ❌      |    ❌    |https://emr.beda.software/healthcare-services|
+| Encounters          |   ✅   |       ❌      |       ✅      |    ❌    |https://emr.beda.software/encounters|
+| Patients            |   ✅   |       ❌      |       ✅      |    ❌    |https://emr.beda.software/patients|
+| Practitioners       |   ✅   |       ❌      |       ❌      |    ❌    |https://emr.beda.software/practitioners|
+| Questionnaires      |  ✅   |       ❌      |       ✅      |    ❌    |https://emr.beda.software/questionnaires| 
+| Scheduling          |   ❌   |       ✅      |       ❌      |    ❌    |https://emr.beda.software/scheduling|
+| Patient's dashboard |   ❌   |       ❌      |       ✅      |    ✅    |https://emr.beda.software/ for the Patient|
+## Demo Credentials
+|Role|Login|Password|
+|----|-----|--------|
+|Admin|admin|password|
+|Receptionist|receptionist|password|
+|Practitioner|practitioner1/practitioner2|password|
+|Patient|patient1/patient2|password|