nnn: add page (#13239)

Co-authored-by: Sebastiaan Speck <[email protected]>

pages/common/nnn.md

@@ -0,0 +1,24 @@
+# nnn
+
+> Interactive terminal file manager and disk usage analyzer.
+> More information: <https://github.com/jarun/nnn>.
+
+- Open the current directory (or specify one as the first argument):
+
+`nnn`
+
+- Start in detailed mode:
+
+`nnn -d`
+
+- Show hidden files:
+
+`nnn -H`
+
+- Open an existing bookmark (defined in the `NNN_BMS` environment variable):
+
+`nnn -b {{bookmark_name}}`
+
+- Sort files on [a]pparent disk usage / [d]isk usage / [e]xtension / [r]everse / [s]ize / [t]ime / [v]ersion:
+
+`nnn -T {{a|d|e|r|s|t|v}}`