you have to just add a work flow in xml like this simple as we define workflow

<record id="act_applied" model="workflow.activity">
            <field name="wkf_id" ref="wkf_emp"/>
            <field name="flow_start">True</field>
            <field name="name">applied</field>
            <field name="kind">function</field>
            <field name="action">write({'state':'applied'})</field>
        </record>

now you want to use button in wizard to trugger a workflow 

step --1  make a wizard .py and .xml file 

step--2 in .xml file define button like this

               <button name="emp_interview" string="Interview" type="workflow" states="applied" />

and now it will trigger a workflow 

Hi! Have you made any progress on this subject? I am struggling with the same issue. I have a wizard working fine, but I would like to make a workflow transition after I submit my wizard information (based on the information user has just submitted) and I can't find any help on this....

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EDIT (Have to edit, since comments are not working)
I'm not sure I understood Kazim Mirza's answer. I've tried many variants of it (copying parts of the already existing workflow to wizard, for example) but none of them worked.
I've submitted a more detailed question here: https://www.odoo.com/forum/Help-1/question/Activate-a-workflow-transition-from-a-wizard-52519

Could you please check it out and point me in the right direction? Thanks!

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Second EDIT

Hi! Thanks to Jos De Graeve, I finally got it to work. The solution is quite simple, but the lack of documentation is sometime frustrating!
You can find it here: https://www.odoo.com/forum/Help-1/question/How-do-I-activate-a-workflow-transition-from-a-wizard-52519#answer-52573