adding nginx page & simulation endpoint

FlaskAPI/controllers/simulation.py

@@ -0,0 +1,23 @@
+from flask import request, Blueprint
+
+simulation_blueprint = Blueprint('simulation_blueprint', __name__)
+
+class SimulationController:
+    def __init__(self):
+        pass
+
+    def harmonic_progression(self, n):
+        sum = 0
+        for i in range(1, n):
+            sum += 1/i
+
+        return sum
+
+simulation_controller = SimulationController()
+
+@simulation_blueprint.route('/simulation/harmonic-progression', methods=['GET'])
+def return_ok():
+    n = int(request.args.get('n'))
+    sum = simulation_controller.harmonic_progression(n)
+
+    return str(sum), 200