Adding PR template - Githubissues

Proposed change(s)

Adding this PR template to repos accepting contributions in order to organize a contributor's development process as well as set a foundation for easier integrations and verifications for reviewers.

Useful links (GitHub issues, JIRA tickets, forum threads, etc.)

AIRO-575.

Types of change(s)

[ ] Bug fix
[ ] New feature
[ ] Code refactor
[ ] Documentation update
[x] Other (please describe): repository template addition.

Testing and Verification

Markdown change only; testing N/A

Test Configuration:

N/A

Checklist

[x] Ensured this PR is up-to-date with the dev branch
[x] Created this PR to target the dev branch
[ ] Followed the style guidelines as described in the Contribution Guidelines
[ ] Added tests that prove my fix is effective or that my feature works
[ ] Updated the documentation as appropriate

Unity-Technologies / URDF-Importer

Adding PR template #73