add switch case to getDegreeByCity-Function

src/main/kotlin/Main.kt

@@ -23,8 +23,11 @@ class MyHandler : HttpHandler {
     }
 
     private fun getDegreeByCity(city: String?): Int{
-        // TODO Get degree from DB or WS
-        return 20
+        return when (city) {
+            "koeln" -> 22
+            "gummersbach" -> 20
+            else -> 15
+        }
     }
 
     private fun getQueryByName(query: String, queryName: String): String? {