feat: add new examples from pocketflow-academy

cookbook/pocketflow-node/utils/call_llm.py

@@ -0,0 +1,13 @@
+from openai import OpenAI
+
+def call_llm(prompt):    
+    client = OpenAI(api_key="YOUR_API_KEY_HERE")
+    r = client.chat.completions.create(
+        model="gpt-4o",
+        messages=[{"role": "user", "content": prompt}]
+    )
+    return r.choices[0].message.content
+    
+if __name__ == "__main__":
+    prompt = "What is the meaning of life?"
+    print(call_llm(prompt))