add header with a link to model

app.py

@@ -14,6 +14,8 @@ def load_model():
     
 tokenizer, model = load_model()
 
+st.write("[Propaganda Techniques Analysis BERT](https://huggingface.co/QCRI/PropagandaTechniquesAnalysis-en-BERT) Tagger")
+
 input = st.text_area('Input', """\
 In some instances, it can be highly dangerous to use a medicine for the prevention or treatment of COVID-19 that has not been approved by or has not received emergency use authorization from the FDA.
 """)