Add github link and license info
Add github link and license info

Fixes #68
wesleyliu/checklist-model,marcopadillo/checklist-model,karthik-suresh/checklist-model,vitalets/checklist-model,karthik-suresh/checklist-model,marcopadillo/checklist-model,wesleyliu/checklist-model,vitalets/checklist-model