lastlog.md: add page (#1817)

pages/linux/lastlog.md

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+# lastlog
+
+> Show the most recent login of all users or of a given user.
+
+- Display the most recent login of all users:
+
+`lastlog`
+
+- Display lastlog record of the specified user:
+
+`lastlog -u {{username}}`
+
+- Display records before than 7 days:
+
+`lastlog -b {{7}}`
+
+- Display records more recent than 3 days:
+
+`lastlog -t {{3}}`