About issue and pull request templates→
With issue and pull request templates, you can customize and standardize the information you'd like contributors to include when they open issues and pull requests in your repository.
Configuring issue templates for your repository→
You can customize the templates that are available for contributors to use when they open new issues in your repository.
Creating a pull request template for your repository→
When you add a pull request template to your repository, project contributors will automatically see the template's contents in the pull request body.
Manually creating a single issue template for your repository→
When you add a manually-created issue template to your repository, project contributors will automatically see the template's contents in the issue body.