pico: add page (#16940)

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <wiktor@perskawiec.cc>

pages/common/pico.md

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+# pico
+
+> Text editor styled after the Alpine Composer.
+> More information: <https://manned.org/pico>.
+
+- Start the editor:
+
+`pico {{path/to/file}}`
+
+- Start the editor with the cursor located n lines into the file:
+
+`pico +{{n}} {{path/to/file}}`
+
+- Start the editor with the cursor shown before the current selection:
+
+`pico -g {{path/to/file}}`
+
+- Define the quote string for files such as email:
+
+`pico -Q "{{quotestring}}" {{path/to/file}}`
+
+- Enable mouse functionality when run within an `xterm` window:
+
+`pico -m {{path/to/file}}`
+
+- Set the operating directory for `pico`:
+
+`pico -o {{path/to/directory}}`
+
+- Enable "view only" mode, which disallows any edits:
+
+`pico -v {{path/to/file}}`
+
+- Displays all files including those beginning with a period:
+
+`pico -a`