Add TGC xAOD PRD
Follow on from !66022 (merged). Again, not complete, but since this isn't used yet we can tweak the contents without impacting anyone else.
cc @jojungge
Edited by Edward Moyse
Follow on from !66022 (merged). Again, not complete, but since this isn't used yet we can tweak the contents without impacting anyone else.
cc @jojungge