upt: add page (#12612)

* upt: add page

---------

Co-authored-by: Fazle Arefin <fazlearefin@users.noreply.github.com>

pages/common/upt.md

@@ -0,0 +1,38 @@
+# upt
+
+> Unified interface for managing packages across various operating systems, like Windows, many Linux distributions, macOS, FreeBSD and even Haiku.
+> It requires the native OS package manager to be installed.
+> See also: `flatpak`, `brew`, `scoop`, `apt`, `dnf`.
+> More information: <https://github.com/sigoden/upt>.
+
+- Update the list of available packages:
+
+`upt update`
+
+- Search for a given package:
+
+`upt search {{search_term}}`
+
+- Show information for a package:
+
+`upt info {{package}}`
+
+- Install a given package:
+
+`upt install {{package}}`
+
+- Remove a given package:
+
+`upt {{remove|uninstall}} {{package}}`
+
+- Upgrade all installed packages:
+
+`upt upgrade`
+
+- Upgrade a given package:
+
+`upt upgrade {{package}}`
+
+- List installed packages:
+
+`upt list`