Add heroku setup files

Author: soukaryag

Procfile

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+web: sh setup.sh && streamlit run app.py

setup.sh

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+mkdir -p ~/.streamlit/
+
+echo "\
+[general]\n\
+email = \"sg4fz@virginia.edu\"\n\
+" > ~/.streamlit/credentials.toml
+
+echo "\
+[server]\n\
+headless = true\n\
+enableCORS=false\n\
+port = $PORT\n\
+" > ~/.streamlit/config.toml