Add READMEs for release notes (#367)

* Add READMEs for release notes

* Update order of info

* Link directly to README

* Correct alpha order

releases/README.md

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+# .NET Framework Releases
+
+You can learn about .NET Framework releases
+
+- .NET Framework 4.6.2 
+   - [Announcement blog post](https://blogs.msdn.microsoft.com/dotnet/2016/08/02/announcing-net-framework-4-6-2/)
+   - [Release notes](net462/README.md)
+- .NET Framework 4.6.1 
+   - [Announcement blog post](https://blogs.msdn.microsoft.com/dotnet/2015/11/30/net-framework-4-6-1-is-now-available/)
+   - [Release notes](net461) 
+- .NET Framework 4.6 
+   - [Announcement blog post](https://blogs.msdn.microsoft.com/dotnet/2015/07/20/announcing-net-framework-4-6/)
+   - [Release notes](net46) 

releases/net462/README.md

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+# .NET Framework 4.6.2 Release Notes
+
+The following information describes the changes made in the .NET Framework 4.6.2 release.
+
+- [Announcement blog post](https://blogs.msdn.microsoft.com/dotnet/2016/08/02/announcing-net-framework-4-6-2/)
+- [Release notes](dotnet462-changes.md)
+- [API changes](dotnet462-api-changes.md)
+
+# Product Areas
+
+- [Active Directory Services](dotnet462-changes.md#active-directory-services)
+- [ASP.NET](dotnet462-changes.md#aspnet)
+- [BCL](dotnet462-changes.md#bcl)
+- [ClickOnce](dotnet462-changes.md#clickonce)
+- [CLR](dotnet462-changes.md#clr)
+- [Networking](dotnet462-changes.md#networking)
+- [SQL](dotnet462-changes.md#sql)
+- [WCF](dotnet462-changes.md#wcf)
+- [Windows Forms](dotnet462-changes.md#windows-forms)
+- [Workflow](dotnet462-changes.md#workflow)
+- [WPF](dotnet462-changes.md#wpf)