SHARED_PREFERENCES:
0. boolean | initialized 	   | @always true
1. boolean | notifications_enabled | false
2. int 	   | days_to_check 	   | 1
3. boolean | notified_high 	   | false
4. boolean | notified_low 	   | false
5. int 	   | value_to_check 	   | 1000
6. String  | APP_VERSION           | 1.0