yetris: add page (#4938)

pages/linux/yetris.md

@@ -0,0 +1,40 @@
+# yetris
+
+> Clone of the game Tetris in the terminal.
+> More information: <https://github.com/alexdantas/yetris>.
+
+- Start a tetris game:
+
+`yetris`
+
+- Navigate the piece horizontally:
+
+`{{Left|Right}} arrow key`
+
+- Rotate the piece clockwise or counterclockwise:
+
+`{{x|z}}`
+
+- Hold a piece (only one allowed at a time):
+
+`c`
+
+- Soft drop the piece:
+
+`Down arrow key`
+
+- Hard drop the piece:
+
+`Spacebar`
+
+- Pause/unpause the game:
+
+`p`
+
+- Quit the game:
+
+`q`
+
+- Show the help during the game:
+
+`h`