Added example for Location Item pattern (#774)

Signed-off-by: Christoph Weitkamp <github@christophweitkamp.de>

configuration/items.md

@@ -284,6 +284,7 @@ Number    Livingroom_Temperature   "Temperature [%.1f °C]"     // e.g. "23.5 °
 String    Livingroom_TV_Channel    "Now Playing [%s]"                  // e.g. "Lorem ipsum"
 DateTime  Livingroom_TV_LastUpdate "Last Update [%1$ta %1$tR]"         // e.g. "Sun 15:26"
 Number    Livingroom_Clock_Battery "Battery Charge [%d %%]"            // e.g. "50 %"
+Location  My_Location              "My Location [%2$s°N %3$s°E %1$sm]" // e.g. "49.26°N 123.19°E 0m"
 ```
 
 {: #state-transformation}