Add some initial history APIs

Weather/Service/Data/Resources/GetReadingValueHistory.sql

@@ -0,0 +1,12 @@
+SELECT bucket,
+       AVG(Value) AS AverageValue
+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,
+                @Value                                                                AS Value
+         FROM Reading
+         WHERE Timestamp BETWEEN @Start AND @End
+     ) AS Data
+GROUP BY Bucket
+ORDER BY Bucket