Add a README file
Add a README file

Describes how to build the project and how the repository is organized.

Change-Id: I4ec01f75b3e53e7429d3f519bec50b5c1158de1c
Signed-off-by: Robert Varga <b8bd3df785fdc0ff42dd1710c5d91998513c57ef@cisco.com>

bigdataops/bgpcep,inocybe/odl-bgpcep,opendaylight/bgpcep,inocybe/odl-bgpcep,bigdataops/bgpcep