Add comments to emissions_calculation.py

app/calculation/emissions_calculation.py

@@ -1,3 +1,6 @@
+# This function is taking the km traveled by a jet and converting it to metric tons of CO2 emitted into the atmosphere. It assumes
+# that all people are flying the same jet
+
 def calculate_emissions(km_traveled):
 
 #source: [https://flybitlux.com/what-is-the-carbon-footprint-of-a-private-jet/]
@@ -6,4 +9,4 @@ def calculate_emissions(km_traveled):
     average_metric_tons_co2_emitted_per_km = 0.003045
     metric_tons_co2_emitted = round(average_metric_tons_co2_emitted_per_km * km_traveled, 2)
 
-    return metric_tons_co2_emitted
+    return metric_tons_co2_emitted