Add code snippets that create the result of an exercise and provide as download

[lnnrtwttkhn]

• [x] Create code snippets (Bash) that implement exercises
• [x] Execute code snippets and package resulting folder for download as .zip file (or some other format, TBD)
• [x] Annotate code snippets to explain the solution

Thanks to @anamartinovici for the inspiration for this idea!

[lnnrtwttkhn]

@all-contributors please add @anamartinovici for ideas

[allcontributors[bot]]

@lnnrtwttkhn

I've put up a pull request to add @anamartinovici! :tada:

[konradpa]

• [x] Add intro and expaination text to exercise site
• [x] Save output of command line and add it below solutions
• [x] rename the recipe repos specific to each exercise e.g. recipes_branches