Update README.md

README.md

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 ## astro
 
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 - [Dynamically change styles from HTML or JSX](/css/dynamically-change-styles-from-html-or-jsx.md)
 - [Make a CSS variable color translucent](/css/make-a-css-variable-color-translucent.md)
 - [Set default styles for tags](/css/set-default-styles-for-tags.md)
+- [Swap between black and white text based on background color](/css/swap-between-black-and-white-text-based-on-background-color.md)
 - [Use CSS variables in a `<dialog>` backdrop](/css/use-css-variables-in-a-dialog-backdrop.md)
 - [Use `grid-template` to set grid columns, rows and areas](/css/use-grid-template-to-set-grid-columns-rows-and-areas.md)