CONTRIBUTING_EN.md

Contributing to Engine

Code Style

This project use Google Java Style as Standard Code Style.

Other：

1. For the file io BE CAREFUL use File，Must replace by Path or URL.
2. If the input parameters can be null, please add @javax.annotation.Nullable to this method.
3. If the return value can be null, please use Optional as return value.
4. If the input parameters and return value can't be null, please add @javax.annotation.Nonnull, and use Validate.notNull() to check the input parameters.
5. Any class that need to be thread safe shold mark as @ThreadSafe.
6. When useing JOML, use it own class（class with letter c e.g. Vector3fc，Matrix4fc）for input parameters.
7. Folder, directory, and package names are named in singular form.
8. When iterating in the serial scenario, BE CAREFUL to use the stream-API.

Commit message format

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