Implement & test C.R.U.D. operations on inventory app

[gringrant]

Implement & test C.R.U.D. operations on inventory containers & items C.R.U.D.=Create Read Update Delete

• [x] Persist data to database
  • [x] Persist to local JSON files
  • [ ] Persist to SQLlite Db
• [ ] CRUD a container with realistic container names
• [x] CRUD a set of realistic items in a container (ie. screw, nut, bolt, motor)
• [x] Browse through existing containers
  • [ ] Browse through items in containers
  • [ ] Move item(s) between containers
  • [ ] Transfer specific number of items between/out of containers
• [X] Add a photo to an item - #86
• [ ] Take a new photo, on a mobile device to add to an item - #85
  • [x] Android
  • [ ] iOS
• [ ] Create 5 containers with 10 items each
• [ ] Restart app with no information lost

[gringrant]

Sub-task of #15