Add traffic light status (#159)

README.md

@@ -1,8 +1,9 @@
 <h1 align="center">pvsite-datamodel</h1>
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-11-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-11-orange.svg?style=flat-square)](#contributors-) 
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
+[![ease of contribution: easy](https://img.shields.io/badge/ease%20of%20contribution:%20easy-32bd50)](https://github.com/openclimatefix/ocf-meta-repo?tab=readme-ov-file#overview-of-ocfs-nowcasting-repositories)
 
 <p align="center">
     <a href="https://pypi.org/project/pvsite-datamodel/0.1.18/" alt="PyPi package">