Get the "Maven Integration for Eclipse (Juno and newer)"(570k installs) plugin from help->eclipse marketplace.

Go to File->import: Existing Maven Projects

Select p2p as Root Directory & hit Finish

Right-click Client->build path->configure build path: Add jars-> sellect all jars in P2P/lib

Import module

Select Maven

set P2P as root dir

File->project structure: Modules->dependencies-> "+": Jars or Directories. Apply.