Example of https://github.com/blog/2111-issue-and-pull-request-templates
All you need to do is create three files:
- CONTRIBUTING.md - contributing guideline which appears while creating new PR or issue
- ISSUE_TEMPLATE.md - template for new issues
- PULL_REQUEST_TEMPLATE.md - template for pull request
You can put these three files in the root of your project or if you want a little bit of organization, you can put it inside .github
directory.