Add chapter7 Agent code

docs/chapter7/Agent/demo.py

@@ -0,0 +1,25 @@
+from src.core import Agent
+from src.tools import add, count_letter_in_string, compare, get_current_datetime
+
+from openai import OpenAI
+
+
+if __name__ == "__main__":
+    client = OpenAI(
+        api_key="your siliconflow api key",
+        base_url="https://api.siliconflow.cn/v1",
+    )
+
+    agent = Agent(
+        client=client,
+        model="Qwen/Qwen2.5-32B-Instruct",
+        tools=[get_current_datetime, add, compare, count_letter_in_string],
+    )
+
+    while True:
+        # 使用彩色输出区分用户输入和AI回答
+        prompt = input("\033[94mUser: \033[0m")  # 蓝色显示用户输入提示
+        if prompt == "exit":
+            break
+        response = agent.get_completion(prompt)
+        print("\033[92mAssistant: \033[0m", response)  # 绿色显示AI助手回答