Add back original blank-csharp example, differentiate it from blank-csharp-with-layer, update README for new example with layer

Author: yualexan

.DS_Store

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+# Blank function with layer (C#)
+
+![Architecture](/sample-apps/blank-csharp/images/sample-blank-csharp.png)
+
+The project source includes function code and supporting resources:
+
+- `src/blank-csharp` - A C# .NET Core function.
+- `1-create-bucket.sh`, `2-deploy.sh`, etc. - Shell scripts that use the AWS CLI to deploy and manage the application.
+
+Use the following instructions to deploy the sample application. For more information on the application's architecture and implementation, see [Managing Spot Instance Requests](https://docs.aws.amazon.com/lambda/latest/dg/services-ec2-tutorial.html) in the developer guide.
+
+# Requirements
+- [.NET Core SDK 6.0](https://dotnet.microsoft.com/download/dotnet-core/6.0)
+- [AWS extensions for .NET CLI](https://github.com/aws/aws-extensions-for-dotnet-cli). Specifically, ensure that you have [Amazon.Lambda.Tools](https://github.com/aws/aws-extensions-for-dotnet-cli#aws-lambda-amazonlambdatools) installed.
+- The Bash shell. For Linux and macOS, this is included by default. In Windows 10, you can install the [Windows Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10) to get a Windows-integrated version of Ubuntu and Bash.
+- [The AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html) v1.17 or newer.
+
+If you use the AWS CLI v2, add the following to your [configuration file](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html) (`~/.aws/config`):
+
+```
+cli_binary_format=raw-in-base64-out
+```
+
+This setting enables the AWS CLI v2 to load JSON events from a file, matching the v1 behavior.
+
+# Setup
+Download or clone this repository.
+
+    $ git clone https://github.com/awsdocs/aws-lambda-developer-guide.git
+    $ cd aws-lambda-developer-guide/sample-apps/blank-csharp
+
+To create a new bucket for deployment artifacts, run `1-create-bucket-and-role.sh`.
+
+    blank-csharp$ ./1-create-bucket.sh
+    make_bucket: lambda-artifacts-d7aec9f2022ef2b4
+    make_bucket: lambda-artifacts-d7aec9f2022ef2b4-dotnet-layer
+    {
+        "Role": {
+            "Path": "/",
+            "RoleName": "blank-csharp-role",
+            "RoleId": "AROA6HOIFXAKKWARP5RSC",
+            "Arn": "arn:aws:iam::978061735956:role/blank-csharp-role",
+            "CreateDate": "2023-08-22T18:12:29+00:00",
+            "AssumeRolePolicyDocument": {
+                "Version": "2012-10-17",
+                "Statement": [
+                    {
+                        "Effect": "Allow",
+                        "Action": [
+                            "sts:AssumeRole"
+                        ],
+                        "Principal": {
+                            "Service": [
+                                "lambda.amazonaws.com"
+                            ]
+                        }
+                    }
+                ]
+            }
+        }
+    }
+
+To build a Lambda layer that contains the function's runtime dependencies, run `2-build-layer.sh`. This also uploads the layer to an S3 bucket created by the first script.
+
+    blank-csharp$ ./2-build-layer.sh
+
+# Deploy
+To deploy the application, run `3-deploy.sh`.
+
+    blank-csharp$ ./3-deploy.sh
+    Amazon Lambda Tools for .NET Core applications (5.8.0)
+    ...
+    Created publish archive ...
+    Creating new Lambda function blank-csharp
+    New Lambda function created
+
+This script uses the .NET Amazon Lambda Tools to deploy the Lambda function. It uses the default settings from the `src/aws-lambda-tools-defaults.json` file.
+
+To invoke the function, run `4-invoke.sh`.
+
+    blank-csharp$ ./4-invoke.sh
+    {
+        "StatusCode": 200,
+        "ExecutedVersion": "$LATEST"
+    }
+    {"FunctionCount":13,"TotalCodeSize":598094248}
+
+Let the script invoke the function a few times and then press `CRTL+C` to exit.
+
+The application uses AWS X-Ray to trace requests. Open the [X-Ray console](https://console.aws.amazon.com/xray/home#/service-map) to view the service map. The following service map shows the function managing spot instances in Amazon EC2.
+
+![Service Map](/sample-apps/blank-csharp-with-layer/images/blank-csharp-servicemap.png)
+
+Choose a node in the main function graph. Then choose **View traces** to see a list of traces. Choose any trace to view a timeline that breaks down the work done by the function.
+
+![Trace](/sample-apps/blank-csharp-with-layer/images/blank-csharp-trace.png)
+
+# Cleanup
+To delete the application, run the cleanup script.
+
+    blank-csharp$ ./5-cleanup.sh

…blank-csharp/1-create-bucket-and-role.sh …p-with-layer/1-create-bucket-and-role.shsample-apps/blank-csharp/1-create-bucket-and-role.sh renamed to sample-apps/blank-csharp-with-layer/1-create-bucket-and-role.sh sample-apps/blank-csharp/1-create-bucket-and-role.sh renamed to sample-apps/blank-csharp-with-layer/1-create-bucket-and-role.sh

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+{
+  "Records": [
+    {
+      "messageId": "19dd0b57-b21e-4ac1-bd88-01bbb068cb78",
+      "receiptHandle": "MessageReceiptHandle",
+      "body": "Hello from SQS!",
+      "attributes": {
+        "ApproximateReceiveCount": "1",
+        "SentTimestamp": "1523232000000",
+        "SenderId": "123456789012",
+        "ApproximateFirstReceiveTimestamp": "1523232000001"
+      },
+      "messageAttributes": {},
+      "md5OfBody": "7b270e59b47ff90a553787216d55d91d",
+      "eventSource": "aws:sqs",
+      "eventSourceARN": "arn:aws:sqs:us-west-2:123456789012:MyQueue",
+      "awsRegion": "us-west-2"
+    }
+  ]
+}