Add EditorCommandAttribute class

This class will be used by Import-EditorCommand to target commands for
registration as editor commands.

Author: SeeminglyScience

src/PowerShellEditorServices/Extensions/EditorCommandAttribute.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace Microsoft.PowerShell.EditorServices.Extensions
+{
+    /// <summary>
+    /// Provides an attribute that can be used to target PowerShell
+    /// commands for import as editor commands.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class)]
+    public class EditorCommandAttribute : Attribute
+    {
+
+        #region Properties
+
+        /// <summary>
+        /// Gets or sets the name which uniquely identifies the command.
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Gets or sets the display name for the command.
+        /// </summary>
+        public string DisplayName { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether this command's output
+        /// should be suppressed.
+        /// </summary>
+        public bool SuppressOutput { get; set; }
+
+        #endregion
+    }
+}