Getting Started with HPSXRP - pastasfuture/com.hauntedpsx.render-pipelines.psx GitHub Wiki
Continue on to these great tutorials to learn how to start using the HPSXRP in your project.
Setting Up the HPSXRP by @leafthief
Still Ridge Devlog: HPS1 Render Pipeline for Unity by @jaybee_tyn aka jaybee#2216