A new command for adding asterisk brackets into your graph

Hi all,

I created an ado for adding asterisk brackets into a graph using the magic of `_gm_edit`.

You can find the command, gradd_ab.ado (version 1.2.0), in the attachment or my Github repo here: https://github.com/LissHall/halltool...main/ado_files

If you encounter any issues, bugs, or have any suggestions, please feel free to contact me through the forum, Github, or email.

Using the command can generate the graphs like this:
(replicate this plot by using `_eg_gradd_ab.do`)
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Some introductions here:
Or you can use `help gradd_ad` to view the help file.
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