ps: add OSX page (#10297)

* ps: add OSX page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/osx/ps.md

@@ -0,0 +1,28 @@
+# ps
+
+> Information about running processes.
+> More information: <https://www.unix.com/man-page/osx/1/ps/>.
+
+- List all running processes:
+
+`ps aux`
+
+- List all running processes including the full command string:
+
+`ps auxww`
+
+- Search for a process that matches a string:
+
+`ps aux | grep {{string}}`
+
+- Get the parent PID of a process:
+
+`ps -o ppid= -p {{pid}}`
+
+- Sort processes by memory usage:
+
+`ps -m`
+
+- Sort processes by CPU usage:
+
+`ps -r`