dstat: add page (#3851)

pages/linux/dstat.md

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+# dstat
+
+> Versatile tool for generating system resource statistics.
+> More information: <http://dag.wieers.com/home-made/dstat>.
+
+- Display CPU, disk, net, paging and system statistics:
+
+`dstat`
+
+- Display statistics every 5 seconds and 4 updates only:
+
+`dstat {{5}} {{4}}`
+
+- Display CPU and memory statistics only:
+
+`dstat --cpu --mem`
+
+- List all available dstat plugins:
+
+`dstat --list`
+
+- Display the process using the most memory and most CPU:
+
+`dstat --top-mem --top-cpu`
+
+- Display battery percentage and remaining battery time:
+
+`dstat --battery --battery-remain`