improve appsettings.json in Maui client

Oqtane.Maui/MauiConstants.cs

@@ -0,0 +1,13 @@
+namespace Oqtane.Maui;
+
+public static class MauiConstants
+{
+    // the API service url (used as fallback if not set in appsettings.json)
+    public static string ApiUrl = ""; 
+    //public static string ApiUrl = "http://localhost:44357/"; // for local development (Oqtane.Server must be already running for MAUI client to connect)
+    //public static string apiurl = "http://localhost:44357/sitename/"; // local microsite example
+    //public static string apiurl = "https://www.dnfprojects.com/"; // for testing remote site
+
+    // specify if you wish to allow users to override the url via appsettings.json in the AppDataDirectory
+    public static bool UseAppSettings = true;
+}