Added Basic UI Functionality

DiscordBotUI/Windows/SettingsPage.axaml.cs

@@ -0,0 +1,44 @@
+using Avalonia.Controls;
+
+using PluginManager;
+
+namespace DiscordBotUI;
+
+public partial class SettingsPage : Window
+{
+    public SettingsPage()
+    {
+        InitializeComponent();
+    }
+
+    private async void ButtonSaveSettingsClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        string token = textBoxToken.Text;
+        string botPrefix = textBoxPrefix.Text;
+        string serverId = textBoxServerId.Text;
+
+        if (string.IsNullOrWhiteSpace(serverId)) serverId = string.Empty;
+        if (string.IsNullOrWhiteSpace(token))
+        {
+            labelErrorMessage.Content = "The token is invalid";
+            return;
+        }
+
+        if(string.IsNullOrWhiteSpace(botPrefix) || botPrefix.Length > 1 || botPrefix.Length < 1)
+        {
+            labelErrorMessage.Content = "The prefix is invalid";
+            return;
+        }
+
+        Config.AppSettings.Add("token", token);
+        Config.AppSettings.Add("prefix", botPrefix);
+        Config.AppSettings.Add("ServerID", serverId);
+
+        await Config.AppSettings.SaveToFile();
+
+        Config.Logger.Log("Config Saved");
+
+        Close();
+
+    }
+}