docs: add simple text generation example (#323)

Ref: #321

examples/text/generation.py

@@ -1,5 +1,5 @@
 """
-Generate text using a model
+Complex text generation example with a progress bar
 
 Runs text generation asynchronously in parallel to achieve better performance
 """

examples/text/simple_generation.py

@@ -0,0 +1,42 @@
+"""
+Simple text generation
+"""
+
+from dotenv import load_dotenv
+
+from genai.client import Client
+from genai.credentials import Credentials
+from genai.schema import (
+    TextGenerationParameters,
+    TextGenerationReturnOptions,
+)
+
+
+def heading(text: str) -> str:
+    """Helper function for centering text."""
+    return "\n" + f" {text} ".center(80, "=") + "\n"
+
+
+# make sure you have a .env file under genai root with
+# GENAI_KEY=<your-genai-key>
+# GENAI_API=<genai-api-endpoint>
+load_dotenv()
+client = Client(credentials=Credentials.from_env())
+
+print(heading("Simple Text Generation"))
+# yields batch of results that are produced asynchronously and in parallel
+for response in client.text.generation.create(
+    model_id="google/flan-t5-xl",
+    inputs=["What is a molecule?", "What is NLP?"],
+    parameters=TextGenerationParameters(
+        max_new_tokens=150,
+        min_new_tokens=20,
+        return_options=TextGenerationReturnOptions(
+            input_text=True,
+        ),
+    ),
+):
+    result = response.results[0]
+    print(f"Input Text: {result.input_text}")
+    print(f"Generated Text: {result.generated_text}")
+    print("")