Merge remote-tracking branch 'origin/dev'
Merge remote-tracking branch 'origin/dev'
Added the Stackoverflow fetcher: if a query did not return any result, it fetches google with the query and displays the first Stackoverflow result.

Backward compatibility should be ok, but many changes were involved. Among others:
- added a config.rb file for personal API credentials
- added a processor.rb file that takes care of formatting displayed texts in the console
- this involves changes in main: say and created method handle_responses