[README.md] new hero image

Author: chrissimpkins

README.md

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 ### An open-source application to create custom static fonts from variable fonts
 
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 ## About
 
 Slice is a GUI application that takes a variable font and compiles a new custom "slice" of the variable design space with user-defined design axis values.  This output file is commonly known as a "static instance" font in type software developer parlance.  The application supports custom font family naming so that you can view output files as different families in application menus.