Added helper to auto discover WLED devices to the readme

RGB.NET.Devices.WLED/README.md

@@ -15,4 +15,68 @@ You can also override the manufacturer and device model in the DeviceDefinition.
 # Required SDK
 This provider does not require an additional SDK.
 
-UDP realtime needs to be enabled on the WLED device.
+UDP realtime needs to be enabled on the WLED device.
+
+# Automatic device discovery
+Due to the requirement of an additional dependency and the requirement to be able to configure devices manually anywy automatic discovery is not part of the provider.   
+
+Using the nuget `Tmds.MDns` you can use the following Helper to do this:
+
+```csharp
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using Tmds.MDns;
+
+namespace RGB.NET.Devices.WLED;
+
+public static class WledDiscoveryHelper
+{
+    /// <summary>
+    /// Searches for WLED devices and returns a list of devices found.
+    /// </summary>
+    /// <param name="waitFor">The time the discovery is waiting for responses. Choose this as short as possible as the method is blocking </param>
+    /// <param name="maxDevices">The maximum amount of devices that are expected in the network. The discovery will stop early if the given amount of devices is found.</param>
+    /// <returns>A list of addresses and device-infos.</returns>
+    public static IEnumerable<(string address, WledInfo info)> DiscoverDevices(int waitFor = 500, int maxDevices = -1)
+    {
+        List<(string address, WledInfo info)> devices = [];
+        using ManualResetEventSlim waitEvent = new();
+
+        int devicesToDetect = maxDevices <= 0 ? int.MaxValue : maxDevices;
+
+        ServiceBrowser mdns = new();
+        mdns.ServiceAdded += OnServiceAdded;
+        mdns.StartBrowse("_http._tcp");
+
+        waitEvent.Wait(TimeSpan.FromMilliseconds(waitFor));
+
+        mdns.StopBrowse();
+        mdns.ServiceAdded -= OnServiceAdded;
+
+        return devices;
+
+        void OnServiceAdded(object? sender, ServiceAnnouncementEventArgs args)
+        {
+            string address = args.Announcement.Addresses.FirstOrDefault()?.ToString() ?? string.Empty;
+            if (!string.IsNullOrWhiteSpace(address))
+            {
+                WledInfo? info = null;
+                try
+                {
+                    info = WledAPI.Info(address);
+                }
+                catch { }
+
+                if (info != null)
+                {
+                    devices.Add((address, info));
+                    if (--devicesToDetect <= 0)
+                        waitEvent.Set();
+                }
+            }
+        }
+    }
+}
+```