[Backend] Add logs

[krismp]

Is your feature request related to a problem? Please describe.
We need to log the backend to make sure it's easier to debug in production environment

Describe the solution you'd like
Feel free to use any logs library of your choice, suggestion: https://github.com/sirupsen/logrus

Additional context
Please read more about log level severity here: https://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels