added and tested pstree.md to basics

_commands/basics/pstree.md

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+---
+---
+
+pstree
+-------
+
+pstree is a command the prints the entire process
+heirarchy as a tree
+
+~~~ bash
+pstree
+
+example output:
+init--parent_ps -- running_ps
+   |-- dif_prnt -- another_run_ps
+~~~
+
+<!--more-->
+
+### Useful Options / Examples
+You can also specify a process id to see all of its children
+or you an specify a user to see all of the processes of that user
+
+#### Example command
+pstree pid
+
+#### Example Output
+ps--children--children
+
+#### Example command
+pstree username
+
+#### Example Output
+prsA -- subprocess -- etc
+
+prsB -- subprocess
+
+prsC -- subprocess
+     |- another one
+
+etc