upower: add page

pages/linux/upower.md

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+# upower
+
+> System utility to provide power and battery information and statistics.
+> More information: <https://upower.freedesktop.org/docs/upower.1.html>.
+
+- Display power and battery information:
+
+`upower --dump`
+
+- List all power devices:
+
+`upower --enumerate`
+
+- Watch for and print power status changes:
+
+`upower --monitor`
+
+- Watch for and print detailed power status changes:
+
+`upower --monitor-detail`
+
+- Display version:
+
+`upower --version`