bmon: add page (#1582)

pages/linux/bmon.md

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+# bmon
+
+> Monitor bandwidth and capture network related statistics.
+
+- Display the list of all the interfaces:
+
+`bmon -a`
+
+- Display data transfer rates in bits per second:
+
+`bmon -b`
+
+- Set policy to define which network interface(s) is/are displayed:
+
+`bmon -p {{interface_1,interface_2,interface_3}}`
+
+- Set interval (in seconds) in which rate per counter is calculated:
+
+`bmon -R {{2.0}}`