A lot of information on this in the fourm. Github way is for those who want to edit the render pipelines and learn from them. If you want to just use them there are two ways to do so.
This is the way to get the Scriptable Render Pipelines
Add to an existing project - Feedback Wanted: Scriptable Render Pipelines page-10#post-3448389
Creating a New Project Using them -
You should take a look at the different threads if you haven’t already (A lot of information of the new rendering pipelines and features) - Unity Engine - Unity Discussions