Add test document

Author: DennisTraub

python/example_code/bedrock-runtime/models/amazon_nova/amazon_nova_text/document_understanding.py

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+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+# snippet-start:[python.example_code.bedrock-runtime.DocumentUnderstanding_AmazonNovaText]
+# Use the Conversation API to send a text message to Amazon Nova.
+
+import boto3
+from botocore.exceptions import ClientError
+
+# Create a Bedrock Runtime client in the AWS Region you want to use.
+client = boto3.client("bedrock-runtime", region_name="us-east-1")
+
+# Set the model ID, e.g., Amazon Nova Lite.
+model_id = "amazon.nova-lite-v1:0"
+
+# Start a conversation with the user message.
+user_message = "Describe the purpose of a 'hello world' program in one line."
+conversation = [
+    {
+        "role": "user",
+        "content": [{"text": user_message}],
+    }
+]
+
+try:
+    # Send the message to the model, using a basic inference configuration.
+    response = client.converse(
+        modelId=model_id,
+        messages=conversation,
+        inferenceConfig={"maxTokens": 512, "temperature": 0.5, "topP": 0.9},
+    )
+
+    # Extract and print the response text.
+    response_text = response["output"]["message"]["content"][0]["text"]
+    print(response_text)
+
+except (ClientError, Exception) as e:
+    print(f"ERROR: Can't invoke '{model_id}'. Reason: {e}")
+    exit(1)
+
+# snippet-end:[python.example_code.bedrock-runtime.DocumentUnderstanding_AmazonNovaText]