Create docs and template for .Net based plugin

[lanatmwan]

The docs seem to imply that an out of proc plugin could be implemented in .net. Please create a c# template like you have for c++ and update the docs.

https://github.com/ms-iot/azure-client-tools/blob/master/docs/device-agent/extensibility-and-discovery-model.md

[namkedia]

Hello, We are working on adding C# plugin support to the device agent and should have it in by end of month.

[lanatmwan]

Checking in. Any update on a release date?

[thj-dk]

Any updates? Here it's a much anticipated feature :-)