Add simple-linked-list exercise

[vaeng]

The #12in23 challenge asks to do the linked-list exercise, which is currently not implemented and should be added during the month of March. As a preliminary task, we include a simpler version that can be built upon.

• Basic file system
• Write tests
• Write exercise stub
• Write an example solution
• Write optional documentation files

[vaeng]

I wonder how we can test that the student made sure that no resources have leaked.

[vaeng]

I would like to merge this soon, so the users can get their March badges. Would you have a look @siebenschlaefer or @exercism/maintainers-admin

[ErikSchierboom]

Thanks a ton for adding this! I'll leave the C++ review to @siebenschlaefer.

[ErikSchierboom]

I'd like to get this PR merged sooner than later, as this is one of the recommended exercises for Mechanical March

@siebenschlaefer do you have time to do a review of this PR?
@vaeng could you look into fixing the diff for the config.json file to not include any formatting changes?

[vaeng]

I'd like to get this PR merged sooner than later, as this is one of the recommended exercises for Mechanical March

@vaeng could you look into fixing the diff for the config.json file to not include any formatting changes?

I had to change the end of line sequence. I uploaded with CRLF but it was LF.

[ErikSchierboom]

LGTM

[siebenschlaefer]

I'm late to the party, sorry. I like this translation, good job!

I have one tiny suggestion: Use std::size_t instead of size_t. The latter will work on all major compilers but technically that's implementation-specific. After including <cstddef> the standard only guarantees the existence of std::size_t.