In my applications, I usually place the .txt file with the license in the assets directory . Read the Github page (I usually use the library with github) about licensing. Notify the original creator of the use of his library. Then, if the product belongs to the client, I will ask you to include the author in the link in the about section (if any). In my own applications, I will include the link and the author in the about section somewhere in my application.
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