Add loss_attack_tutorial w/ outputs to OSS release (#72)

Summary:
Pull Request resolved: #72

Adds "loss_attack_tutorial.ipynb" for use in OSS release.

The tutorial renders in Github with the outputs saved

 {F1982346657}

Reviewed By: iden-kalemaj

Differential Revision: D83500065

fbshipit-source-id: ea0b63670fb7f623430959ccbb9471710fa0f9c3

Author: mgrange1998