Base: Add man page for pidof

Base/usr/share/man/man1/pidof.md

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+## Name
+
+pidof - list pids for a given process name
+
+## Synopsis
+
+```sh
+$ pidof [-s] [-o pid] [-S separator] <process-name>
+```
+
+## Options
+
+* `-o pid`: Omit the given pid, or the parent process if the special value %PPID is passed
+* `-s`: Only return one pid
+* `-S separator`: Use `separator` to separate multiple pids
+
+## Arguments
+
+* `process-name`: Process name to search for