chore: import upstream snapshot with attribution

examples/models/deepseek-chat.py

@@ -0,0 +1,36 @@
+import asyncio
+import os
+
+from browser_use import Agent
+from browser_use.llm import ChatDeepSeek
+
+# Add your custom instructions
+extend_system_message = """
+Remember the most important rules: 
+1. When performing a search task, open https://www.google.com/ first for search. 
+2. Final output.
+"""
+deepseek_api_key = os.getenv('DEEPSEEK_API_KEY')
+if deepseek_api_key is None:
+	print('Make sure you have DEEPSEEK_API_KEY:')
+	print('export DEEPSEEK_API_KEY=your_key')
+	exit(0)
+
+
+async def main():
+	llm = ChatDeepSeek(
+		base_url='https://api.deepseek.com/v1',
+		model='deepseek-chat',
+		api_key=deepseek_api_key,
+	)
+
+	agent = Agent(
+		task='What should we pay attention to in the recent new rules on tariffs in China-US trade?',
+		llm=llm,
+		use_vision=False,
+		extend_system_message=extend_system_message,
+	)
+	await agent.run()
+
+
+asyncio.run(main())