Base: Add pape man page documentation

Base/usr/share/man/man1/pape.md

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+## Name
+
+pape - manage the system wallpaper.
+
+## Synopsis
+
+```**sh
+$ pape [--show-all] [--show-current] [name]
+```
+
+## Description
+
+The `pape` utility can be used to set the system wallpaper and
+list available wallpapers in the `/res/wallpapers/` directory.
+
+## Options
+
+* `-a`, `--show-all`: Show all wallpapers
+* `-c`, `--show-current`: Show current wallpaper
+
+## Examples
+
+Set wallpaper to `/res/wallpapers/grid.png`:
+
+```**sh
+$ pape grid.png
+```
+
+List available wallpapers:
+
+```**sh
+$ pape -a
+```