docs: about isInEditor (#424)

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

README.md

@@ -504,6 +504,21 @@ export default antfu({
 })
 ```
 
+### Editor Specific Disables
+
+Some rules are disabled when inside ESLint IDE integrations, namely [`unused-imports/no-unused-imports`](https://www.npmjs.com/package/eslint-plugin-unused-imports) [`test/no-only-tests`](https://github.com/levibuzolic/eslint-plugin-no-only-tests)
+
+This is to prevent unused imports from getting removed by the IDE during refactoring to get a better developer experience. Those rules will be applied when you run ESLint in the terminal or [Lint Staged](#lint-staged). If you don't want this behavior, you can disable them:
+
+```js
+// eslint.config.js
+import antfu from '@antfu/eslint-config'
+
+export default antfu({
+  isInEditor: false
+})
+```
+
 ### Lint Staged
 
 If you want to apply lint and auto-fix before every commit, you can add the following to your `package.json`: