Added a safe system to store the password and added a cmd argument to change the credentials

[Kripta-Studios]

Now writing stackexplain -credentials you can change the credentials stored in the .setting.json Furthermore, I implemented a system of key-token to safely store the key of the account, because before the password was saved as plain text in the file.

[MarcelloTheArcane]

Your pull request overwrites the original owner's attribution. Is this by design?