Submission jhr_skip_list

[Garfield1002]

I got inspired by stb and wrote a single file implementation of Skip Lists.

It is C++ only.

Here is a link to the repository: https://github.com/Garfield1002/jhr_skip_list

[Garfield1002]

I wrote a C89 version for this library, it can be found at https://github.com/Garfield1002/jrsl.

[r-lyeh]

Closing ticket. Link(s) should be already in the list. Please double-check.