Implementation of Statistics

[mironbarykin]

Provides basic abilities of saving, recording and updaing the statistics on our need.

Done

• functions for loading, saving and creating stats.json file
• function to increment statistics (both total and today)
• function to review and delete expired entries

20

[KorryKatti]

will approve once checks are done. Thanks for the PR

[KorryKatti]

works , tested locally , thanks