add requirements and fix app.py

app.py

@@ -1,6 +1,5 @@
 import streamlit as st
 from transformers import pipeline
-from PIL import Image
 
 pipeline = pipeline(task="image-classification", model="julien-c/hotdog-not-hotdog")
 

requirements.txt

@@ -0,0 +1,3 @@
+transformers
+streamlit
+