Flask backend return index.html & values endpoint

Specified custom static & template folder for compatibility with `npm run build`

.gitignore

@@ -26,3 +26,5 @@ coverage
 *.njsproj
 *.sln
 *.sw?
+
+__pycache__/

app.py

+from flask import Flask, jsonify, render_template 
+from flask_cors import CORS
+
+app = Flask(__name__, static_folder="./dist/assets", template_folder="./dist")
+CORS(app)
+
+@app.route("/")
+def main():
+    return render_template("index.html")
+
+@app.route("/values")
+def values():
+    values = [{"N": 10}, {"P": 11}, {"K": 12}, {"T": 5}, {"H": 6}, {"M": 7}]
+    return jsonify(values)