Add weather icons to concepts doc

Author: Muhammad Sehgal (Aquent LLC)

articles/azure-maps/weather-services-concepts.md

@@ -45,7 +45,7 @@ Some of the Weather service APIs allow user to specify if the data is returned e
 |22      |integer             |
 
 | Icon Number |Icon| Day | Night | Text |
-|-------------|----|-----|-------|------|
+|-------------|:----:|-----|-------|------|
 | 1           |![](./media/weather-services-concepts/Sunny.png)| Yes |  No   | Sunny|
 | 2           |![](./media/weather-services-concepts/MostlySunny.png)| Yes |  No   | Mostly sunny|
 | 3           |![](./media/weather-services-concepts/HazySunshine.png)| Yes |  No   | Hazy sunshine|