Add Collection Validator, create collection based on nfo

Based on nfo's set element, automatically add movie to collection.

Signed-off-by: Petrus.Z <silencly07@gmail.com>

Emby.Server.Implementations/Library/Validators/CollectionPostScanTask.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Controller.Collections;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Persistence;
+using Microsoft.Extensions.Logging;
+
+namespace Emby.Server.Implementations.Library.Validators
+{
+    /// <summary>
+    /// Class CollectionPostScanTask.
+    /// </summary>
+    public class CollectionPostScanTask : ILibraryPostScanTask
+    {
+        /// <summary>
+        /// The _library manager.
+        /// </summary>
+        private readonly ILibraryManager _libraryManager;
+        private readonly ICollectionManager _collectionManager;
+        private readonly ILogger<CollectionValidator> _logger;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CollectionPostScanTask" /> class.
+        /// </summary>
+        /// <param name="libraryManager">The library manager.</param>
+        /// <param name="collectionManager">The collection manager.</param>
+        /// <param name="logger">The logger.</param>
+        public CollectionPostScanTask(
+            ILibraryManager libraryManager,
+            ILogger<CollectionValidator> logger,
+            ICollectionManager collectionManager)
+        {
+            _libraryManager = libraryManager;
+            _collectionManager = collectionManager;
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// Runs the specified progress.
+        /// </summary>
+        /// <param name="progress">The progress.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        public Task Run(IProgress<double> progress, CancellationToken cancellationToken)
+        {
+            return new CollectionValidator(_libraryManager, _collectionManager, _logger).Run(progress, cancellationToken);
+        }
+    }
+}