Profiler: Add help documentation

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+## Name
+
+Profiler - Serenity process profiler
+
+## Synopsis
+
+```**sh
+$ Profiler [--pid PID] [perfcore file]
+```
+
+## Description
+
+Profiler facilitates process performance profiling and provides a GUI offering
+visual graph and tree representations to easily navigate generated profiling
+information.
+
+If no arguments are provided, a window containing a list of running processes
+is presented, allowing a process to be selected for profiling.
+
+Profiling information is written to `perfcore.<pid>` in the working directory
+and opened immediately for browsing following termination of profiling.
+
+Profiler can also load performance information from previously created
+`perfcore` files.
+
+## Options
+
+* `-p PID`, `--pid PID`: PID to profile
+
+## Examples
+
+Profile running Shell process:
+
+```sh
+$ Profiler -p $(pidof Shell)
+```
+
+Open a previously created perfcore file for browsing:
+
+```sh
+$ Profiler perfcore.123
+```
+
+## See also
+
+* [`perfcore`(5)](../man5/perfcore.md)
+