Implement LICENSE files for third party software

[apolopena]

Problem this feature will solve

Currently, third party softwares do not have LICENSE files

Background

Give credit where credit is due. Also comply with copyright laws.

Proposed Solution

All code in bash/third-party should be in its own directory, named by the repository it came from.
Currently the only third party software used in this project is tlatsas/bash-spinner#6
This script has been modified a little (spinner uses four shades of green) so put

# Modified by: Apolo Pena

In the comments in the header.
Also put this file in bash/third-party/bash-spinner/

Constraints and Assumptions

Refactor code to call bash/third-party/bash-spinner/spinner.sh