Create curvy-pears-perform.md

.changeset/curvy-pears-perform.md

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+---
+"eslint-plugin-primer-react": minor
+---
+
+Add a `checkAllStrings` option to the `no-deprecated-colors` rule.
+
+If `checkAllStrings` is set to `true`, the `no-deprecated-colors` rule will check for deprecated colors in all strings. This is useful for catching uses of deprecated colors outside system props and the `sx` prop.
+
+  ```js
+  /* eslint primer-react/no-deprecated-colors: ["warn", {"checkAllStrings": true}] */
+  import {Box} from '@primer/components'
+
+  function ExampleComponent() {
+    const styles = {
+      // Enabling `checkAllStrings` will find deprecated colors used like this:
+      color: 'text.primary'
+    }
+    return <Box sx={styles}>Hello</Box>
+  }
+  ```