cpulimit: add page (#3067)

pages/linux/cpulimit.md

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+# cpulimit
+
+> A tool to throttle the CPU usage of other processes.
+> More information: <http://cpulimit.sourceforge.net/>.
+
+- Limit an existing process with PID 1234 to only use 25% of the CPU:
+
+`cpulimit --pid {{1234}} --limit {{25%}}`
+
+- Limit an existing program by its executable name:
+
+`cpulimit --exe {{program}} --limit {{25}}`
+
+- Launch a given program and limit it to only use 50% of the CPU:
+
+`cpulimit --limit {{50}} {{program}}`
+
+- Launch a program, limit its CPU usage to 50% and run cpulimit in the background:
+
+`cpulimit --limit {{50}} --background {{program}}`
+
+- Kill its process if the program's CPU usage goes over 50%:
+
+`cpulimit --limit 50 --kill {{program}}`
+
+- Throttle both it and its child processes so that none go about 25% CPU:
+
+`cpulimit --limit {{25}} --monitor-forks {{program}}`