Added note recommending .NET Standard (#6541)

* Added note recommending .NET Standard

* Corrected case of 'We'

Author: Ron Petrusha

docs/standard/cross-platform/app-resources-for-libraries-that-target-multiple-platforms.md

@@ -1,6 +1,6 @@
 ---
 title: "App Resources for Libraries That Target Multiple Platforms"
-ms.date: "03/30/2017"
+ms.date: "07/18/2018"
 ms.technology: dotnet-standard
 dev_langs: 
   - "csharp"
@@ -17,6 +17,8 @@ ms.author: "mairaw"
 ---
 # App Resources for Libraries That Target Multiple Platforms
 You can use the .NET Framework [Portable Class Library](../../../docs/standard/cross-platform/cross-platform-development-with-the-portable-class-library.md) project type to ensure that resources in your class libraries can be accessed from multiple platforms. This project type is available in [!INCLUDE[vs_dev11_long](../../../includes/vs-dev11-long-md.md)] and targets the portable subset of the .NET Framework class library. Using  a [!INCLUDE[net_portable](../../../includes/net-portable-md.md)] ensures that your library can be accessed from desktop apps, Silverlight apps, Windows Phone apps, and [!INCLUDE[win8_appname_long](../../../includes/win8-appname-long-md.md)] apps.  
+
+[!INCLUDE[standard](../../../includes/pcl-to-standard.md)]
 
  The [!INCLUDE[net_portable](../../../includes/net-portable-md.md)] project makes only a very limited subset of the types in the <xref:System.Resources> namespace available to your application, but it does allow you to use the <xref:System.Resources.ResourceManager> class to retrieve resources. However, if you are creating an app by using Visual Studio, you should use the strongly typed wrapper created by Visual Studio instead of using the <xref:System.Resources.ResourceManager> class directly.  
 

docs/standard/cross-platform/cross-platform-development-with-the-portable-class-library.md

@@ -1,6 +1,6 @@
 ---
 title: "Cross-Platform Development with the Portable Class Library"
-ms.date: "03/30/2017"
+ms.date: "07/18/2018"
 ms.technology: dotnet-standard
 helpviewer_keywords: 
   - "Portable Class Library [.NET Framework]"
@@ -12,7 +12,9 @@ ms.author: "mairaw"
 ---
 # Cross-Platform Development with the Portable Class Library
 The .NET Framework Portable Class Library project type in Visual Studio helps you build cross-platform apps and libraries for Microsoft platforms quickly and easily.  
-  
+
+[!INCLUDE[standard](../../../includes/pcl-to-standard.md)]
+
  Portable class libraries can help you reduce the time and costs of developing and testing code. Use this project type to write and build portable .NET Framework assemblies, and then reference those assemblies from apps that target multiple platforms such as Windows and Windows Phone.  
 
  Even after you create a Portable Class Library project in Visual Studio and start developing it, you can change the target platforms. Visual Studio will compile your library with the new assemblies, which helps you identify the changes you need to make in your code.  

docs/standard/cross-platform/index.md

@@ -1,6 +1,6 @@
 ---
 title: "Developing for Multiple Platforms with the .NET Framework"
-ms.date: "03/30/2017"
+ms.date: "07/18/2018"
 ms.technology: dotnet-standard
 ms.assetid: b153baaa-130c-4169-860b-e580591de91e
 author: "mairaw"
@@ -9,7 +9,10 @@ ms.author: "mairaw"
 # Developing for Multiple Platforms with the .NET Framework
 You can develop apps for both Microsoft and non-Microsoft platforms by using the .NET Framework and Visual Studio.  
 
-## Options for cross-platform development  
+## Options for cross-platform development
+
+[!INCLUDE[standard](../../../includes/pcl-to-standard.md)]
+  
  To develop for multiple platforms, you can share source code or binaries, and you can make calls between .NET Framework code and Windows Runtime APIs.  
 
 |If you want to...|Use...|  

docs/standard/cross-platform/using-portable-class-library-with-model-view-view-model.md

@@ -1,6 +1,6 @@
 ---
 title: "Using Portable Class Library with Model-View-View Model"
-ms.date: "03/30/2017"
+ms.date: "07/18/2018"
 ms.technology: dotnet-standard
 dev_langs: 
   - "csharp"
@@ -14,7 +14,9 @@ ms.author: "mairaw"
 ---
 # Using Portable Class Library with Model-View-View Model
 You can use the .NET Framework [Portable Class Library](../../../docs/standard/cross-platform/cross-platform-development-with-the-portable-class-library.md) to implement the Model-View-View Model (MVVM) pattern and share assemblies across multiple platforms.  
-  
+
+[!INCLUDE[standard](../../../includes/pcl-to-standard.md)]
+
  MVVM is an application pattern that isolates the user interface from the underlying business logic. You can implement the model and view model classes in a [!INCLUDE[net_portable](../../../includes/net-portable-md.md)] project in [!INCLUDE[vs_dev11_long](../../../includes/vs-dev11-long-md.md)], and then create views that are customized for different platforms. This approach enables you to write the data model and business logic only once, and use that code from .NET Framework, Silverlight, Windows Phone, and [!INCLUDE[win8_appname_long](../../../includes/win8-appname-long-md.md)] apps, as shown in the following illustration.  
 
  ![Portable with MVVM diagram](../../../docs/standard/cross-platform/media/portablemvvmdiagram.png "PortableMVVMdiagram")  

includes/pcl-to-standard.md

@@ -0,0 +1,2 @@
+> [!IMPORTANT]
+> Because Portable Class Library projects target only a very specific subset of .NET implementations, we strongly discourage their use in new application development. The recommended replacement is a .NET Standard library, which targets all .NET implementations that support a specific version of the .NET Standard. For more information, see [.NET Standard](~/docs/standard/net-standard.md).