Add shell.nix and test program

.gitignore

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+app/__pycache__

app/dummy_request.py

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+from requests import get
+
+
+def dummy_request(url):
+    request = get(url)
+    print(request.text)
+
+
+def main():
+    dummy_request(
+        "https://opendata.paris.fr/api/records/1.0/search/?dataset=velib-disponibilite-en-temps-reel&q=&facet=name&facet=is_installed&facet=is_renting&facet=is_returning&facet=nom_arrondissement_communes"
+    )
+
+
+if __name__ == "__main__":
+    main()

shell.nix

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+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs.python37Packages;
+
+pkgs.mkShell {
+  buildInputs = [
+    # Dependencies
+    pandas
+    requests
+    flask
+    altair
+    pytest
+    # Development tools
+    black
+    isort
+    pyflakes
+    python-language-server
+    pyls-black
+    pyls-isort
+  ];
+}