neo: add page (#20979)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/neo.md

@@ -0,0 +1,37 @@
+# neo
+
+> Simulate the digital rain from "The Matrix".
+> See also: `cmatrix`.
+> More information: <https://manned.org/neo>.
+
+- Set scroll speed and asynchronous columns:
+
+`neo {{[-S|--speed]}} {{12}} {{[-a|--async]}}`
+
+- Change text color and colormode:
+
+`neo {{[-c|--color]}} {{green}} --colormode {{256}}`
+
+- Display a centered message:
+
+`neo {{[-m|--message]}} "{{Hello World}}"`
+
+- Set droplet density and glitch percentage:
+
+`neo {{[-d|--density]}} {{2.0}} {{[-G|--glitchpct]}} {{20.0}}`
+
+- Use a specific charset:
+
+`neo --charset {{ascii|greek|cyrillic|arabic|braille|runic|...}}`
+
+- Clear the screen:
+
+`<Space>`
+
+- Exit neo:
+
+`{{<Esc>|<q>}}`
+
+- Display help:
+
+`neo {{[-h|--help]}}`