docs: Update Readme.md (#67)

Adding note on repo moving to maintenance mode.
GoogleChromeLabs · Nov 8, 2022 · a1997ca · a1997ca
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 # Container Query Polyfill
 
+*Please note that this polyfill is now in maintenance mode, as of Nov, 2022. We are not planning to add more features or enhancements.*
+____________________________
+
 A small (9 kB compressed) polyfill for CSS Container Queries using [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver) and [`MutationObserver`](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) supporting the full [`@container`](https://drafts.csswg.org/css-contain-3/) query syntax:
 
 - Discrete queries (`width: 300` and `min-width: 300px`)