missed file

Dear @Malayanil ,
Thank you for sharing..
The app seems to lack main, add_to_db and update file. 
Thanks

```
ash-3.2$ python3 root.py
python: can't open file 'main.py': [Errno 2] No such file or directory
python: can't open file 'add_to_db.py': [Errno 2] No such file or directory
python: can't open file 'update.py': [Errno 2] No such file or directory
```