Update README.md

README.md

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+![License](https://img.shields.io/github/license/alexander-forbes/celloc)
+![Nuget](https://img.shields.io/nuget/dt/celloc?label=nuget)
+![Issues](https://img.shields.io/github/issues/alexander-forbes/celloc)
+
 # Celloc
 An Excel cell index converter.
 
 ## NuGet
 To install the package from NuGet, run the following command: 
 `PM> Install-Package Celloc`
+
+## Usage
+See the [Wiki](https://github.com/alexander-forbes/celloc/wiki) for more information on how to use Celloc.