Add README.md

Author: mattkalina

api-example-csharp/README.md

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+# Spire API Example Using C#
+
+## Overview
+
+This project is intends to provide example usage of the Spire REST API using
+Microsoft .NET Framework 4.6. The project will build and run as-is, and can be
+modified to suit your own requirements.
+
+
+## Documentation
+
+Please see the following for the most up-to-date documentation:
+
+[API Documentation](https://localhost:10880/doc) (requires Spire Server)
+[RestSharp](http://restsharp.org)
+[Json.NET](http://www.newtonsoft.com/json)
+[REST API Tutorial](http://www.restapitutorial.com/)