pidstat: add page (#3529)

pages/linux/pidstat.md

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+# pidstat
+
+> Show system resource usage, including CPU, memory, IO etc.
+
+- Show CPU statistics at a 2 second interval for 10 times:
+
+`pidstat {{2}} {{10}}`
+
+- Show page faults and memory utilization:
+
+`pidstat -r`
+
+- Show input/output usage per process id:
+
+`pidstat -d`
+
+- Show information on a specific PID:
+
+`pidstat -p {{PID}}`
+
+- Show memory statistics for all processes whose command name include "fox" or "bird":
+
+`pidstat -C "{{fox|bird}}" -r -p ALL`