gomoku: add page (#23353)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>

pages/common/gomoku.md

@@ -0,0 +1,20 @@
+# gomoku
+
+> Play the classic 5-in-a-row strategy board game.
+> More information: <https://manned.org/man/gomoku>.
+
+- Start the game:
+
+`gomoku`
+
+- Move the cursor:
+
+`{{<h>|<j>|<k>|<l>|<ArrowLeft>|<ArrowDown>|<ArrowUp>|<ArrowRight>}}`
+
+- Select the cell:
+
+`<Space>`
+
+- Quit the game:
+
+`<q>`