First of all download the template package from here. For an overview of the functionality see another post.
Extract the zip file and move to the Bin folder.
In the bin folder three files are located:
If you prefer building the code by yourself have a look into the Source folder. What you have to do is build the C# project, and zip all the project templates. Then zip all three zip-files together with the .VSContent file to a .ZIP archive and rename it to .VSI.
Have fun :-)
And see this post for usage of the templates.