Add curl commands to quickly fetch example files

[Midnighter]

• [x] fix #92
• [x] description of feature/fix
• [x] tests added/passed
• [x] add an entry to the changelog

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b3388fb) 81.64% compared to head (9023b2f) 81.64%.

:exclamation: Current head 9023b2f differs from pull request most recent head 5bf5f4a. Consider uploading reports for the commit 5bf5f4a to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #97 +/- ## ======================================== Coverage 81.64% 81.64% ======================================== Files 103 103 Lines 1585 1585 Branches 129 274 +145 ======================================== Hits 1294 1294 Misses 250 250 Partials 41 41 ```

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[Midnighter]

Given its bash commands, to simplify even further couldn't you even do expansion, I.re. MOCK_00{1,2,3} within the single command?

It already uses expansion MOCK_*.metaphlan3_profile.txt or what do you mean?