update readme

Author: requestmethod

README.md

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 # tailwind-plugin-css-themes
 
 A Tailwind CSS plugin to create themes using CSS classes and variables.
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 This package is written in TypeScript and uses [dnt](https://github.com/denoland/dnt) (Deno to Node Transform) to build the package for NPM.
 
+### Install deno
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+See the [official deno installation guide](https://deno.land/[email protected]/getting_started/installation).
+
 ### Build package locally in TypeScript, ESM, CJS
 
 ```shell
 deno run -A scripts/build.ts
 ```
 
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