Added initializedparams

Author: david-driscoll

src/Protocol/General/IInitializedHandler.cs

@@ -1,5 +1,5 @@
 using OmniSharp.Extensions.JsonRpc;
-
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
 // ReSharper disable CheckNamespace
 
 namespace OmniSharp.Extensions.LanguageServer.Protocol
@@ -11,5 +11,5 @@ public static partial class GeneralNames
     }
 
     [Serial, Method(Initialized)]
-    public interface IInitializedHandler : INotificationHandler { }
+    public interface IInitializedHandler : INotificationHandler<InitializedParams> { }
 }

src/Protocol/Models/InitializedParams.cs

@@ -0,0 +1,12 @@
+using System;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
+using OmniSharp.Extensions.LanguageServer.Protocol.Serialization;
+
+namespace OmniSharp.Extensions.LanguageServer.Protocol.Models
+{
+    public class InitializedParams
+    {
+    }
+}