docs: add comprehensive CREDEBL UI user guide

Signed-off-by: konaspandana017 <[email protected]>

Author: konaspandana017

docs/CREDEBL-UI-User-Guide.md

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+# CREDEBL UI User Guide
+
+## Introduction
+CREDEBL is an open-source Self-Sovereign Identity (SSI) and Verifiable Credentials platform.  
+This guide helps users navigate the CREDEBL User Interface (UI) efficiently.
+
+## Accessing the Platform
+1. Open your browser.
+2. Navigate to your environment:
+   - Local development: `http://localhost:5000`
+   - Hosted environment: as provided by your administrator
+3. Log in using your credentials or developer account for local setups.
+
+## Dashboard Overview
+- **Users**: Manage users and their credentials.
+- **Ledger**: View issued credentials and verification history.
+- **Organizations**: Manage organizational accounts and credentials.
+- **Connections**: Track SSI connections and their status.
+- **Issuance & Verification**: Issue credentials or verify existing ones.
+
+## Navigation
+- Use the **sidebar menu** to switch between modules.
+- Hover over icons to see tooltips explaining their functions.
+- Use search bars and filters to quickly locate records.
+
+## Modules
+
+### Users
+- **Add User**: Fill required fields and click *Create*.
+- **Search Users**: Filter by ID, name, or email.
+- **View Details**: Click on a user to view full credentials and history.
+
+### Ledger
+- Lists all issued credentials with columns like credential ID, type, issuer, and status.
+- Filter results by type, status, or date range.
+
+### Organizations
+- **Add Organization**: Provide name, type, and assign credentials.
+- **Manage Credentials**: Assign, revoke, or view credentials for organizations.
+
+### Connections
+- Shows active SSI connections including status, last activity, and associated users.
+- Use filters to locate specific connections.
+
+### Issuance & Verification
+- **Issue Credential**:
+  1. Select credential type.
+  2. Choose recipient (user or organization).
+  3. Fill required fields.
+  4. Click *Issue Credential*.
+- **Verify Credential**:
+  1. Enter credential ID.
+  2. System checks ledger.
+  3. Displays verification result.
+
+## Best Practices
+- Verify credentials before issuing.
+- Ensure all environment variables are correctly configured.
+- Restart services if UI is not reflecting updates.
+
+## Troubleshooting
+- **UI not accessible**: Confirm API Gateway and microservices are running.
+- **Credential issuance errors**: Check Prisma database schema and restart services.
+- **UI outdated**: Clear browser cache or restart frontend.
+
+## Additional Resources
+- [CREDEBL GitHub Repository](https://github.com/credebl/platform)
+- [Backend Setup & Environment Guide](README.md)
+- [Docker & NATS Documentation](https://docs.docker.com/)
+
+---
+
+*This guide is maintained by contributors and will be updated as CREDEBL evolves.*