[AUR-411] Adopt to Example2 project (#28)

Add the chatbot from Example2. Create the UI for chat.

knowledgehub/chatbot/simple_respondent.py

@@ -0,0 +1,13 @@
+from theflow import Node
+
+from ..llms import ChatLLM
+from .base import BaseChatBot
+
+
+class SimpleRespondentChatbot(BaseChatBot):
+    """Simple text respondent chatbot that essentially wraps around a chat LLM"""
+
+    llm: Node[ChatLLM]
+
+    def _get_message(self) -> str:
+        return self.llm(self.history).text[0]