Update README.md

Author: JonnyOThan

README.md

@@ -6,3 +6,5 @@ KSP Build Tools
 ![NuGet Version](https://img.shields.io/nuget/vpre/KSPBuildTools)
 
 This repository aims to provide a common set of tools for developing mods for Kerbal Space Program. Note that it's still in "alpha" stages so expect things to change or break.
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+[Full Documentation](https://kspbuildtools.readthedocs.io/en/docs/index.html)