Merge pull request #4449 from abbitude/patch-2

Update index.md

Author: jmeridth

collections/green-software/index.md

@@ -4,6 +4,7 @@ items:
  - kube-green/kube-green
  - marmelab/greenframe-cli
  - ThijsRay/coppers
+ - github/GreenSoftwareDirectory
 
 display_name: Green Software
 created_by: tomthorogood