Add app.py with Streamlit UI

app.py

@@ -0,0 +1,23 @@
+import streamlit as st
+
+from src.category_classification.models import models as class_models
+from src.common import Input
+
+@st.cache_data
+def load_class_model(name):
+    model = class_models.get_model(name)
+    return model
+
+
+model_name = st.selectbox(
+    "Select model",
+    options=class_models.get_all_model_names()
+)
+title = st.text_area("Paper title")
+abstract = st.text_area("Paper abstract")
+
+if title:
+    input = Input(title=title, abstract=abstract)
+    model = load_class_model(model_name)
+    out = model(input)
+    st.json(out)