Added a Contributing.md for the Version3 branch code.
Added a Contributing.md for the Version3 branch code.

lwasylow/utPLSQL,proldan/utPLSQL,viniciusam/utPLSQL,Shoelace/utPLSQL,utPLSQL/utPLSQL,pesse/utPLSQL,jgebal/utPLSQL,proldan/utPLSQL,pesse/utPLSQL,Shoelace/utPLSQL,lwasylow/utPLSQL,viniciusam/utPLSQL,jgebal/utPLSQL