You've got some git-splainin' to do
This plugin allows you to easily insert a template into the page when you open a new Pull Request on GitHub, either automatically or by clicking the Pull Request icon that appears in the URL bar. Clicking the icon again will remove an unedited version of the template. The plugin uses a simple pre-defined template, but the options page allows users to set their own template by supplying a URL, editing the template manually, or a combination of the two. When setting a new template, all open Pull Requests using an unedited version of the template will be updated with the new version upon save. Users can also opt to have their new Pull Requests filled with the template automatically. With this option, the plugin will detect when users are opening a new Pull Request and automatically populate the Pull Request body field. Upon setting this option, all empty Pull Requests in open tabs will be populated with the template. Git ready to ‘splain yourself.
More information on Pull Request templates: https://quickleft.com/blog/pull-request-templates-make-code-review-easier/
Source code available at: https://github.com/iceddev/git-splainin