I don't understand why this needs a client. Why not just install these as man pages in their own section and read them with man? EDIT: My idea is of course not new, see https://github.com/joelekstrom/tldr-man for a way to convert these docs to man pages.
This is a good opportunity for me to compare the out-of-the-box results from tldr vs man:
https://linux.die.net/man/1/man
"Why not just install these as man pages in their own section and read them with man?" Because downloading the default program is much easier, most users aren't that concerned about adding a small CLI program on their computer, and most aren't that purist about right way to read documentation is through manpages.