Add endpoint to get several bucketed values

Weather/Service/Data/Resources/GetReadingHistoryGrouped.sql

@@ -0,0 +1,20 @@
+SELECT bucket,
+	   AVG(HumidityTemperature) AS AverageHumidityTemperature,
+	   AVG(Humidity) AS AverageHumidity,
+       AVG(PressureTemperature) AS AveragePressureTemperature,
+       AVG(Pressure) / 100 AS AveragePressure,
+	   AVG(LightLevel) AS AverageLightLevel
+FROM (
+         SELECT CAST(FORMAT(Timestamp, 'yyyy-MM-ddTHH:') +
+                RIGHT('00' + CAST(DATEPART(MINUTE, Timestamp) / @BucketMinutes * @BucketMinutes AS VARCHAR), 2)
+				+ ':00+00:00' AS DATETIMEOFFSET)									  AS Bucket,
+                HumidityTemperature,
+				Humidity,
+				PressureTemperature,
+				Pressure,
+				LightLevel
+         FROM Reading
+         WHERE Timestamp BETWEEN @Start AND @End
+     ) AS Data
+GROUP BY Bucket
+ORDER BY Bucket