Welcome !
The ShaderTools is an add-on developed for the Blender3D users. With this add on, apply a complex material is more easy. Its aim is to allow you access to a library of pre-configured materials more easyly and integrate them into your projects.
Many users try to use Blender3D but the adaptation can ask very long time for somebody. It's for this reason the ShaderTools was born.
It can integrate pre-configured materials, you can save your own materials, export them and share them in few clicks.
You can use the left menu to access features of this addon. You can found inside different categories the answers for most questions.
You can join us on the Blenderclan site, the Python Scripting forum if you need more informations on this add-on.
Happy discovery and happy blending :).