sar: add page (tldr-pages#1532)

pages/linux/sar.md

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+# sar
+
+> Monitor performance of various Linux subsystems.
+
+- Report I/O and transfer rate issued to physical devices, one per second (press CTRL+C to quit):
+
+`sar -b {{1}}`
+
+- Report a total of 10 network device statistics, one per 2 seconds:
+
+`sar -n DEV {{2}} {{10}}`
+
+- Report CPU utilization, one per 2 seconds:
+
+`sar -u ALL {{2}}`
+
+- Report a total of 20 memory utilization statistics, one per second:
+
+`sar -r ALL {{1}} {{20}}`
+
+- Report the run queue length and load averages, one per second:
+
+`sar -q {{1}}`
+
+- Report paging statistics, one per 5 seconds:
+
+`sar -B {{5}}`