docs(subjects): add link to official docs

subjects/README.md

@@ -19,3 +19,5 @@ An alternative way is to press `ctrl + shift + i`, but this might vary depending
 When the document is formatted, you should be able to see the Prettier text with the double tick on the bottom right corner of your window as in the image. If you only see one, another way to run it is by clicking on the `Prettier` text.
 
 ![double-tick-prettier](double-tick-prettier.png)
+
+For instructions on how to set up Prettier in other code editors, or for setting up the CLI tool, please check the [official docs](https://prettier.io/docs/en/install.html)