PULL_REQUEST_TEMPLATE.YAML added

[Brijeshthummar02]

Description

Added pull_req template in yaml format.

issue #21 .

Testing done

### Submitter checklist
- [x] If an issue exists, it is well described and linked in the description
- [ ] The description of this pull request is detailed and explain why this pull request is needed
- [ ] The changeset is on a specific branch. Using `feature/` for new feature, or improvements ; Using `fix/` for bug fixes ; Using `docs/` for any documentation changes.
- [ ] If required, the documentation has been updated
- [ ] There is automated tests to cover the code change / addition or an explanation why there is no tests in the description.