Documentation: Enabling debugging for tapback

[fquesnel]

It would be great to update the documentation to explain how to enable debugging for tapback.

Thanks,
Flavien

[matelakat]

@fquesnel - If you know how to do that, could you propose a pull request? If you don't know how to do that, just ignore my comment.

[fquesnel]

@matelakat - I do not know how to do that :-)

[fquesnel]

Could you please review pull request #128, which is related to this issue?
Thanks,
Flavien