feat: Add C# Classic Load Balancer (#180)

* Add C# Classic Load Balancer

* minor semantic/typo fixes

csharp/classic-load-balancer/.gitignore

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csharp/classic-load-balancer/README.md

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+
+# Classic Load Balancer
+<!--BEGIN STABILITY BANNER-->
+---
+
+![Stability: Stable](https://img.shields.io/badge/stability-Stable-success.svg?style=for-the-badge)
+
+> **This is a stable example. It should successfully build out of the box**
+>
+> This examples is built on Construct Libraries marked "Stable" and does not have any infrastructure prerequisites to build.
+
+---
+<!--END STABILITY BANNER-->
+
+This example creates an AutoScalingGroup (containing a Micro-T3 EC2 machine running the Amazon Linux AMI), and a ClassicLoadBalancer inside a shared VPC. It hooks up an open listener from the Load Balancer to the Scaling Group to indicate how many targets to balance between.
+
+For more info on using Auto Scaling with Load Balancing see the AutoScaling guide [here](https://docs.aws.amazon.com/autoscaling/ec2/userguide/autoscaling-load-balancer.html).
+
+## Build
+
+To build this app, you need to be in this example's root folder. Then run the following:
+
+```bash
+npm install -g aws-cdk
+dotnet build src
+```
+
+This will install the necessary CDK, then this example's dependencies, and then build your .Net Project files and your CloudFormation template.
+
+## Deploy
+
+Run `cdk deploy ClassicLoadBalancerStack`. This will deploy / redeploy your Stack to your AWS Account.
+
+After the deployment you will see the API's URL, which represents the url you can then use.
+
+## Synthesize Cloudformation Template
+
+To see the Cloudformation template generated by the CDK, run `cdk synth ClassicLoadBalancerStack`, then check the output file in the "cdk.out" directory.

csharp/classic-load-balancer/cdk.context.json

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+{
+  "@aws-cdk/core:enableStackNameDuplicates": "true"
+}

csharp/classic-load-balancer/cdk.json

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