Added the storage interface

Author: FlorianRappl

AngleSharp.Io/AngleSharp.Io.csproj

@@ -49,7 +49,8 @@
     <Compile Include="ConfigurationExtensions.cs" />
     <Compile Include="Dom\WebSocketReadyState.cs" />
     <Compile Include="Extensions\GeneralExtensions.cs" />
-    <Compile Include="Dom\IWebSocket.cs" />
+    <Compile Include="Dom\WebSocket.cs" />
+    <Compile Include="Interfaces\IStorage.cs" />
     <Compile Include="Network\HttpClientRequester.cs" />
     <Compile Include="Network\Response.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

AngleSharp.Io/Dom/IWebSocket.cs renamed to AngleSharp.Io/Dom/WebSocket.cs

@@ -0,0 +1,50 @@
+namespace AngleSharp.Io.Dom
+{
+    using AngleSharp.Attributes;
+    using System;
+
+    /// <summary>
+    /// Represents the Storage interface. For more information see:
+    /// http://www.w3.org/TR/webstorage/#the-storage-interface
+    /// </summary>
+    [DomName("Storage")]
+    [DomExposed("Window")]
+    public interface IStorage 
+    {
+        /// <summary>
+        /// Gets the number of stored keys.
+        /// </summary>
+        [DomName("length")]
+        Int32 Length { get; }
+
+        /// <summary>
+        /// Gets the key at the given index, if any.
+        /// </summary>
+        /// <param name="index">The index of the key.</param>
+        /// <returns>The key or null.</returns>
+        [DomName("key")]
+        String Key(Int32 index);
+
+        /// <summary>
+        /// Gets or sets the item's value.
+        /// </summary>
+        /// <param name="key">The key of the item.</param>
+        /// <returns>The value if any.</returns>
+        [DomAccessor(Accessors.Getter | Accessors.Setter)]
+        String this[String key] { get; set; }
+
+        /// <summary>
+        /// Removes the item with the specified key.
+        /// </summary>
+        /// <param name="key">The key of the item to remove.</param>
+        [DomAccessor(Accessors.Deleter)]
+        [DomName("removeItem")]
+        void Remove(String key);
+
+        /// <summary>
+        /// Clears all items from the storage.
+        /// </summary>
+        [DomName("clear")]
+        void Clear();
+    }
+}