SQUBS-560: Added Traceability section to CONTRIBUTING.md
SQUBS-560: Added Traceability section to CONTRIBUTING.md

SarathChandran/squbs,mzeltser69/squbs,anilgursel/squbs,keshin/squbs,paypal/squbs,tutufool/squbs,Harikiranvuyyuru/squbs,akara/squbs,talst/squbs,az-qbradley/squbs