additional resource location:
    before packaging: the project directory of the project 

    1. electron-egg/build/extraResources


    after packaging: software installation directory

    1. # windows (example)
    2. D:\test\ee\resources\extraResources
    4. # macOS (example)
    5. /Applications/ee.app/Contents/Resources/extraResources
    7. # Linux (example)
    8. ...