Add first snippet to PeriodDemo class
Add first snippet to PeriodDemo class

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