Adding missing copyright header.

Ix.NET/Source/System.Interactive.Async.Providers/AsyncQueryable.Generated.cs

@@ -1,4 +1,8 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Threading;

Ix.NET/Source/System.Interactive.Async.Providers/AsyncQueryable.Generated.tt

@@ -1,4 +1,8 @@
-<#@ template debug="false" hostspecific="false" language="C#" #>
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+<#@ template debug="false" hostspecific="false" language="C#" #>
 <#@ assembly name="System.Core" #>
 <#@ assembly name="$(ProjectDir)\..\System.Interactive.Async\bin\$(Configuration)\net45\System.Interactive.Async.dll" #>
 <#@ import namespace="System.Linq" #>

Ix.NET/Source/System.Interactive.Async.Providers/AsyncQueryable.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information. 
+
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;