yetris: add page

[sahilister]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform directory (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.
• The page description includes a link to documentation or a homepage (if applicable).

[sbrl]

Thanks for the new page! I've left some comments below for you to review.

[sbrl]

I'm not sure what the r in brackets is for here? Also, perhaps this will read better?

Suggested change

	> Tetris(r) game clone in terminal.
	> Clone of the game Tetris in the terminal.

[sahilister]

So the Tetris name and brand is trademarked by The Tetris Company.

I was/am not sure how that will work out here or legality of the name usage, so added "(r)" to it, which I saw in another Tetris clone's Debian manpage here.

[sbrl]

Ah, I see. I was not aware of that!

[bl-ue]

• The page has 8 or fewer examples.

@sahilister it has 9!

[sbrl]

Erm oops! This page has 9 examples, but our limit is 8 examples per page. @sahilister, would you be able to open a pull request to correct this please?

[bl-ue]

@sbrl I've done this already @ #5079, in support of #5046.

[sbrl]

Nice work, @bl-ue! I'm still working my way through my GH notifications (70 GH notifications? I thought it was Hacktoberfest for a moment 😅), so I haven't seen those yet.

[bl-ue]

Wow! That's a lot! Since you added me they've been coming a lot more, probably :)

[sbrl]

Thanks so much, @bl-ue! Don't burn yourself out though 😅