If you want to submit your theme then create a new question featuring your theme something like this Donut theme. After you have done this, its time to submit your theme to q2a Add-Ons page, for that you need to notify the creator of Q2A (Gideon) about your theme though feedback page and then your theme will be listed on Add-Ons page as well.
I hope this helps.
send feed back : http://www.question2answer.org/feedback.php
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April 20, 2021: Q2A 1.8.6 released!