Change-Id: I0b245f1177e3df04ddc6f345213bbb1207d3e950
major functions are added for Path specification. added backend engine infra skeleton. Change-Id: Ia923b02649cff545fa768ab8538ad7187195826f
Introduce project skeleton such as build envrionment and interfaces to build up code further cooperatively. Change-Id: Ie9ac38991f609d33637283134906d7cc3f2ac19e