add Repository
repo as static
Load in backing fields
add SandwichRepository and OrderRepository
Initialize in Commands and Store in Repo
removed ConfigApp, changed variable names and types, changed validation in AddOrderArgs
change validation, added constructor in Commands, variable for filename
change IList to IEnumerable, SandwichNum equal 0
use IEnumerable in addorder
Merge pull request #11 from ela-compil/repository

Repository