Add boilerplate for Railway reference app. Bug: 225226520 Test: m RailwayReferenceApp Change-Id: I32ac0db1833164f7af90740ed09f22b360fd3bc6 Merged-In: I32ac0db1833164f7af90740ed09f22b360fd3bc6 (cherry picked from commit I32ac0db1833164f7af90740ed09f22b360fd3bc6)