[#10] Add fake sessions for test
[#10] Update entities
[#10] Update entities
[#10] Save times into database
[#11] Create list of past sessions
[#12] app/src/main/java/com/ilsecondodasinistra/workitout/utils/CounterWorkingTime.java
Revert "[#12] app/src/main/java/com/ilsecondodasinistra/workitout/utils/CounterWorkingTime.java"

This reverts commit 7cc612fbe6fd1fb21e6d366e1221e9b3acf79394.
Revert "Revert "[#12] app/src/main/java/com/ilsecondodasinistra/workitout/utils/CounterWorkingTime.java""

This reverts commit 4741c58a98ffb5ca9f70100f614a74193c6e48df.
Pasticcio con i commit ;(