added random question button

app.py

@@ -50,6 +50,7 @@ This QA demo uses a [Haystack Extractive QA Pipeline](https://haystack.deepset.a
 an [InMemoryDocumentStore](https://haystack.deepset.ai/components/document-store) which contains abstracts of 17k+ research papers associated with SRM university.''')
 
 query = st.text_input('Enter a query to get started:', value=st.session_state.question, max_chars=100, on_change=reset_results)
+st.button('Random Question', on_click=lambda:st.session_state['question']=choice(queries))
 
 def ask_question(query):
     start = time.time()