Hello I have got question how to add fonts to a project in EE_2.0. I have tried to do this by drag and drop fonts to the editor (like drag and drop e.g. image) but it hasn't worked. In other words: how to add fonts to the project in EE_2.0. Thanks in advance.

You need to create new Font element in Project
in the System Font textfield, enter the name of a font (that font must be installed in your system, probably c:/Windows/Fonts folder)
like "Arial", "Times new roman", ..