docs(nifi): add deployment configuration steps

Technical/Deployment-Guides/Nifi-Deployment-Guide.md

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+<!-- SPDX-License-Identifier: Apache-2.0 -->
+
+# NiFi Deployment and Configuration Guide
+
+After deploying NiFi using Docker Compose, complete the following configuration steps before starting the flow.
+
+---
+
+## 1. Configure AWS Credentials
+
+Navigate to:
+
+**NiFi Menu → Controller Services**
+
+Locate the **AWSCredentialsProviderControllerService** and configure:
+
+- **Access Key ID**
+- **Secret Access Key**
+
+> **Security Note**
+> For production environments, prefer secure credential management approaches instead of hardcoding AWS credentials.
+
+---
+
+## 2. Configure Database Controller Services
+
+Navigate to:
+
+**NiFi Menu → Controller Services**
+
+Configure the required database controller services used in the flow.
+
+For each required database service:
+
+1. Open the controller service configuration.
+2. Enter the required database credentials (username/password).
+3. Verify connection properties such as:
+   - JDBC URL (if applicable)
+   - Driver class (if applicable)
+
+> Note: The exact database services depend on the deployed NiFi flow configuration.
+
+---
+
+## 3. Configure Parameter Contexts
+
+Navigate to:
+
+**NiFi Menu → Parameter Contexts**
+
+The following parameter contexts are provided with the deployment template. Update their values according to your environment.
+
+### pbucket
+
+Used by **UpdateAttribute** processors.
+
+- `bucket-name`: `tazama`
+
+> Default bucket name is **tazama** (case-sensitive).
+
+---
+
+### phttp
+
+Used by **InvokeHTTP** processors.
+
+Update values as required for your environment, such as:
+
+- API endpoint URL
+- Host configuration values (if applicable)
+
+---
+
+### pozone
+
+Used by **PutS3Bucket / S3-related processors**
+
+Update values such as:
+
+- `bucket-name`
+- Any environment-specific storage configuration
+
+---
+
+## 4. Enable Controller Services
+
+After completing all configuration steps above:
+
+1. Navigate to **Controller Services**
+2. Select all configured services
+3. Click the **Enable (lightning bolt)** icon
+4. Ensure all services show **Enabled** state
+
+> Do not enable services until all configuration is completed.
+
+---
+
+## 5. Start NiFi Processors
+
+1. Select processors:
+   - To select a single processor: **Shift + Left Click**
+   - To select all processors: **Ctrl + A**
+
+2. Open the **Operate** menu
+3. Click **Start**
+
+Verify that all processors transition to **Running** state.
+
+---
+
+## Validation Checklist
+
+Before considering the deployment complete, ensure:
+
+- AWS credentials are configured
+- Database credentials are configured
+- Parameter contexts are updated
+- All controller services are enabled
+- All processors are running successfully
+- No validation errors are visible in NiFi UI
+
+---
+
+## Troubleshooting
+
+If processors fail to start:
+
+1. Check processor validation errors
+2. Verify controller service status
+3. Confirm parameter context values
+4. Validate database connectivity
+5. Verify AWS configuration
+
+---
+
+## Summary
+
+This guide ensures NiFi is properly configured after Docker Compose deployment and is ready to process flows with external AWS services and database integrations.