Add readMe for sample project

samples/csharp/readme.md

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+# FCVS API Sample (C#)
+
+This solution contains a simple test application for working with the API. 
+
+*The code is an example of how you might use the API and has not been tested or hardened for production use.*
+
+## Run the Code
+
+To run this sample do the following.
+
+1. Download the entire solution directory to your local machine.
+1. Open the solution (`.sln`) in Visual Studio 2019 or higher.
+1. Compile the solution.
+1. Run the solution.