feat: Add C# ElasticBeanstalk

csharp/elasticbeanstalk/elasticbeanstalk-bg-pipeline/.gitignore

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csharp/elasticbeanstalk/elasticbeanstalk-bg-pipeline/README.md

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+## Code Pipeline : Blue/Green deployments to Elastic Beanstalk
+<!--BEGIN STABILITY BANNER-->
+---
+
+![Stability: Experimental](https://img.shields.io/badge/stability-Experimental-important.svg?style=for-the-badge)
+
+> **This is an experimental example. It may not build out of the box**
+>
+> This examples does is built on Construct Libraries marked "Experimental" and may not be updated for latest breaking changes.
+>
+> It additionally requires infrastructure prerequisites that must be created before successful build.
+>
+> If build is unsuccessful, please create an [issue](https://github.com/aws-samples/aws-cdk-examples/issues/new) so that we may debug the problem 
+
+---
+<!--END STABILITY BANNER-->
+
+Code Pipeline does not allow Blue/Green deployments to Elastic Beanstalk, which is a feature that is very useful to zero-downtime production deployments.
+
+There are a couple of requirements to make this work:
+
+1. 2 Elastic Beanstalk environments: one Blue, and one Green.
+
+2. A Lambda function that will be used to create an application version from the input artifact, deploy to the blue environment, and swap CNAMEs with the green environment.
+
+3. The Lambda execution role should have permissions to make calls to CodePipeline, and Elastic Beanstalk. 
+
+### Note: Leveraging L1 resources
+
+### Instructions
+
+1. Change the name of the blue env, green env, and the EB application name in "cdk.json"
+2. Install and configure the CDK: https://docs.aws.amazon.com/CDK/latest/userguide/install_config.html
+
+```
+npm install -g aws-cdk
+dotnet build src
+cdk bootstrap
+cdk synth ElasticbeanstalkBgPipelineStack
+cdk deploy ElasticbeanstalkBgPipelineStack
+```

csharp/elasticbeanstalk/elasticbeanstalk-bg-pipeline/cdk.json

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+{
+  "app": "dotnet run -p src/ElasticbeanstalkBgPipeline/ElasticbeanstalkBgPipeline.csproj"
+}