Added sidebar

app.py

@@ -1,4 +1,41 @@
 import streamlit as st
 
-x = st.slider('Select a value')
-st.write(x, 'squared is now', x * x)
+st.set_page_config(layout="wide")
+
+with st.sidebar:
+    st.title('Document Summarization and QA System')
+    st.markdown('''
+    ## About this application
+    Upload a pdf to ask questions about it. This retrieval-augmented generation (RAG) workflow uses:
+    - [Streamlit](https://streamlit.io/)
+    - [LlamaIndex](https://docs.llamaindex.ai/en/stable/)
+    - [OpenAI](https://platform.openai.com/docs/models)
+    ''')
+
+    st.write('Made by ***Nate Mahynski***')
+    st.write('nathan.mahynski@nist.gov')
+
+    # Select Provider
+    provider = st.selectbox(
+        label="Select LLM Provider",
+        options=['openai', 'huggingface'],
+        index=0
+    )
+
+    # Select LLM
+    if provider == 'openai':
+        llm_list = ['gpt-3.5-turbo', 'gpt-4', 'gpt-4-turbo', 'gpt-4o']
+    else:
+        llm_list = []
+
+    llm = st.selectbox(
+        label="Select LLM Model",
+        options=llm_list,
+        index=0
+    )
+
+    # Enter Token
+    token = st.text_input(
+        "Enter your token",
+        value=None
+    )