Add langchain

app.py

@@ -1,9 +1,19 @@
 import streamlit as st
+from langchain.memory import ConversationBufferMemory
+from langchain.memory.chat_message_histories import StreamlitChatMessageHistory
+
+msgs = StreamlitChatMessageHistory()
+memory = ConversationBufferMemory(memory_key="history", chat_memory=msgs)
 
 st.title("🪩🤖")
 
-st.chat_message("ai").write("Ask me anything about orb community projects!")
+if len(msgs.messages) == 0:
+    msgs.add_ai_message("Ask me anything about orb community projects!")
+
+for msg in msgs.messages:
+    st.chat_message(msg.type).write(msg.content)
 
 if prompt := st.chat_input("Ask something"):
-    st.write(f"User has sent the following prompt: {prompt}")
-    
+    st.chat_message("human").write(prompt)
+    # Run
+    st.chat_message("ai").write("hehe")

requirements.txt

@@ -1 +1,2 @@
-langchain
+langchain
+streamlit