Add a /conditions/current endpoint

internal/core/current_conditions.go

@@ -0,0 +1,15 @@
+package core
+
+import "gitea.maximumdirect.net/ejr/weatherfeeder/model"
+
+// CurrentConditions is an averaged current-conditions aggregate over a recent window.
+type CurrentConditions struct {
+	TemperatureC            *float64
+	ApparentTemperatureC    *float64
+	DewpointC               *float64
+	RelativeHumidityPercent *float64
+	WindSpeedKmh            *float64
+	WindDirectionDegrees    *float64
+	ConditionCode           model.WMOCode
+	IsDay                   *bool
+}