.NET (C#) wrappers for Zoho Invoice

I had a look around but was unable to find sample code for accessing Zoho Invoice using .NET|C#. As a result, I wrote my own. If anyone's interested in leveraging this code, please let me know and I'll get it published somewhere for others to use.

It's currently a basic implementation that was focused on getting me up-and-running using Zoho Invoice from an existing project. It achieves this goal. I've only written support for Zoho Invoice and only for Customers and Invoices (hoping to add Organizations if I can find the methods!) but the code should be easily extensible.