Adding SteamMatchmakingServers interface (for uniformity)

Facepunch.Steamworks/SteamMatchmakingServers.cs

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+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using Steamworks.Data;
+
+namespace Steamworks
+{
+	/// <summary>
+	/// Functions for clients to access matchmaking services, favorites, and to operate on game lobbies
+	/// </summary>
+	public class SteamMatchmakingServers : SteamClass
+	{
+		internal static ISteamMatchmakingServers Internal;
+		internal override SteamInterface Interface => Internal;
+
+		internal override void InitializeInterface()
+		{
+			Internal = new ISteamMatchmakingServers();
+		}
+	}
+}