Add notes around plans for tooling.
Add notes around plans for tooling.

BenJenkinson/nodatime,BenJenkinson/nodatime,jskeet/nodatime,jskeet/nodatime,malcolmr/nodatime,malcolmr/nodatime,malcolmr/nodatime,nodatime/nodatime,malcolmr/nodatime,nodatime/nodatime