Simple password based encryption

[hadasz]

Overview

Create a password protected encrypted video file for the bootleg video asset.

Acceptance

• A list of manual procedures that allows a small group of known buyers to get a decrypted downloadable video with the minimum acceptance criterion being that there is reasonable security that others won't be able to get it easily

[brian-lc]

Can possibly reuse the AWS encryption script/process created as part of the dONT project. https://github.com/ConsenSys/web3studio-bootleg/tree/master/packages/aws-cli-encrypt

[brian-lc]

Readme updated in bootleg-app to cover encryption steps. Also full details on encryption and process here https://docs.google.com/document/d/1Fx8dQpUCHRiUWmd8_2EbC1-rfTudd45uO8wJ7kaVizQ/edit?usp=sharing