If you recall in Chapter 2, Character Building, I said you will create a package that contains all the default folders you can use for any project; so, let's do that.
First, create a new project (just because it's best to start from scratch) and then add in whatever folders, assets, scripts, and so on that you need in your asset package. In this case, just all the folders we will commonly use in any Unity project are shown here:
Here, you can select all the assets currently in your project that you want bundled up in your own reusable Unity asset package. Once you are happy with your selection, just click on Export…. Then, Unity will simply ask where you want your package to be created: