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Please i think it would be anwersome to create a geme by myself but I don't kow to make the terminal :)
So if you have any answer please write down ;)
I think you should familiarize yourself with the unity UI system and specifically the input field and how to use it in c#. You can also learn how to import custom graphics into unity for your UI. If you don't know how to program in c# at all I recommend watching a beginners tutorial series on it I will link to Brackey's one below.