feature: usage documentation

app/main.py

@@ -34,6 +34,21 @@ async def ask_question(question: str, context: str):
     Returns:
     A JSON object with the 'answer' field containing the response from 
         the chatbot.
+    
+    Example:
+
+    1. Go to the Swagger UI.
+    2. Scroll down to the /chatbot POST method section.
+    3. Click on the Try it out button.
+    4. In the question field, enter: "What is the capital of France?"
+    5. In the context field, enter: "France is a country in Western 
+        Europe. It has several beautiful cities, including Paris, which 
+        is its capital. France is known for its wine, sophisticated 
+        cuisine, and landmarks like the Eiffel Tower."
+    6. Click the Execute button to submit the request.
+    7. Scroll down to see the server response, where you will find the 
+        answer.
+
     """
     result = question_answerer(question=question, context=context)
     return {'answer': result['answer']}