Resolve "Add license"

Closes #53 (closed)

Please fill in the appropriate checklist below (delete whatever is not relevant). These are the most common things requested on pull requests (PRs).

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated

.gitlab/merge_request_templates/merge_request.md

 
-Please fill in the appropriate checklist below (delete whatever is not relevant). 
+Please fill in the appropriate checklist below (delete whatever is not relevant).
 These are the most common things requested on pull requests (PRs).
 
 ## PR checklist
@@ -8,4 +8,4 @@ These are the most common things requested on pull requests (PRs).
  - [ ] Documentation in `docs` is updated
  - [ ] `CHANGELOG.md` is updated
  - [ ] `README.md` is updated
-
+ - [ ] `LICENSE.md` is updated with new contributors