Yes, create a button and in the function just create the text file like

file = open("newfile.txt", "w")
file.write("hello world in the new file")
file.write("and another line")
file.close()

 then just add all you need.

Kind Regards.

Gustavo, i try your answer, and odoo  tells me that: 

creafich() takes at least 4 arguments (1 given)

Hi, hope you it help
https://www.odoo.com/es_ES/forum/ayuda-1/question/not-able-to-create-simple-txt-report-in-odoo-101033#answer-101052