Add Sample for .NET Framework with Windows CI/CD Pipeline

[csantos]

Given that .NET Framework is a common application framework in legacy enterprise applications an example of leveraging Proton for such a use case would be valuable.

As enterprise customers with .NET Framework applications look to migrate their workloads to AWS, Proton provides organizations with platform teams with the means necessary to enforce standards and yet provide application teams to stand up their environments, deploy their applications, and setup a CI/CD pipeline with the necessary flexibility.