added example query option

ProtHGT_app.py

@@ -1,6 +1,7 @@
 import os
 import streamlit as st
 from rapidfuzz import process
+import random
 
 # with st.spinner("Initializing the environment... This may take up to 10 minutes at the start of each session."):
 #     # Create a temporary placeholder for the message
@@ -84,10 +85,14 @@ with st.sidebar:
     # Add protein selection methods
     selection_method = st.radio(
         "Choose input method:",
-        ["Search proteins", "Upload protein ID file"]
+        ["Use example query", "Search proteins", "Upload protein ID file"]
     )
 
-    if selection_method == "Search proteins":
+    if selection_method == "Use example query":
+        st.session_state.example_proteins = random.sample(available_proteins, 5)
+        selected_proteins = st.session_state.example_proteins
+
+    elif selection_method == "Search proteins":
         # User enters search term
         search_query = st.text_input("Start typing a protein ID (at least 3 characters)", "")