Merge pull request #79 from aws-samples/2023_sample_applications_dir

adding dir for 2023

Author: bjhogan

SampleApplications/2023/readme.md

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+## AWS .NET Samples
+
+AWS employees who love .NET on AWS are currently working on a new set of sample application for 2023 to share with you. As the work progress they will appear here.
+
+In the meantime, check out the [sample applications gallery](https://aws.amazon.com/developer/language/net/net-sample-applications/).