Update README.md (#14)

README.md

@@ -21,6 +21,18 @@ jobs:
           GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 ```
 
+## Create the needed labels
+
+Export both `GITHUB_TOKEN` and `REPO` (e.g. `pascalgn/size-label-action`) and run the script bellow:
+
+```bash
+for size in XL XXL XS S M L; do
+	curl -sf -H "Authorization: Bearer $GITHUB_TOKEN" "https://api.github.com/repos/kubernetes/kubernetes/labels/size/$size" |
+		jq '. | { "name": .name, "color": .color, "description": .description }' |
+		curl -sfXPOST -d @- -H "Authorization: Bearer $GITHUB_TOKEN" https://api.github.com/repos/$REPO/labels
+done
+```
+
 ## Configuration
 
 The following environment variables are supported: