Document new options parameter for buildShortcut function

[joshfarrant]

#16 added support for an optional options parameter to the buildShortcut function.

Currently, the supported options are:

buildShortcut([], {
  icon: {
    color: COLORS.LIGHT_BLUE // Or any color specified in src/meta/colors.ts
    glyph: GLYPHS.E9AE // Or any glyph specified in src/meta/glyphs.ts
  },
});

Currently, this functionality isn't documented anywhere. It would be useful to add some information about this feature (along with an example) to the README.

Additionally, we could improve the typedoc documentation comments for the buildShortcut function to include information about the options object and it's accepted types.

[xAlien95]

I inserted some information about this feature in my work in progress documentation fork. You can edit its temporary contents here: @xAlien95:docs :: Documentation/Metadata/ShortcutIcon/content.md.

[joshfarrant]

Looking really good!

_{Sent with GitHawk}