Add project files.

src/LiteCharmsSecurity.STS.Identity/Services/AuditEventSink.cs

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+// Copyright (c) Jan Škoruba. All Rights Reserved.
+// Licensed under the Apache License, Version 2.0.
+
+using System.Threading.Tasks;
+using Duende.IdentityServer.Events;
+using Duende.IdentityServer.Services;
+using Microsoft.Extensions.Logging;
+
+namespace LiteCharmsSecurity.STS.Identity.Services
+{
+    public class AuditEventSink : DefaultEventSink
+    {
+        public AuditEventSink(ILogger<DefaultEventService> logger) : base(logger)
+        {
+        }
+
+        public override Task PersistAsync(Event evt)
+        {
+            return base.PersistAsync(evt);
+        }
+    }
+}