Remove extra README and LICENSE files

Remove LICENSE and README files that were replaced in last commit.
Update README to include sample output

Update README to include sample output from the tool:
```
+-----------+-----------+---------+
| Disk Size |           |         |
+-----------+-----------+---------+
| Free      | 16.09 GB  | 6.91%   |
| Used      | 216.87 GB | 93.09%  |
| Total     | 232.96 GB | 100.00% |
+-----------+-----------+---------+
```