Grasscutter/.github/PULL_REQUEST_TEMPLATE.md

## Description

Please carefully read the [Contributing note](https://github.com/Grasscutters/Grasscutter/blob/stable/CONTRIBUTING.md) and [Code of conduct](https://github.com/Grasscutters/Grasscutter/blob/development/CODE_OF_CONDUCT.md) before making any pull requests.
And, **Do not make a pull request to merge into stable unless it is a hotfix. Use the development branch instead.**
## Issues fixed by this PR

<!--- Put the links of issues that may be fixed by this PR here (if any). -->
## Type of changes

<!--- Put an `x` in all the boxes that apply your changes. -->

- [ ] Bug fix
- [ ] New feature 
- [ ] Enhancement
- [ ] Documentation

## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] My pull request is unique and no other pull requests have been opened for these changes
- [ ] I have read the [Contributing note](https://github.com/Grasscutters/Grasscutter/blob/stable/CONTRIBUTING.md) and [Code of conduct](https://github.com/Grasscutters/Grasscutter/blob/development/CODE_OF_CONDUCT.md)
- [ ] I am responsible for any copyright issues with my code if it occurs in the future.