message: Add intro & contribution paragraph to coding style.
diff: # General
  +A guide to our coding style and conventions.
  +
  +We try to have reasonable rules and follow them to the best of our capabilities, so that we can:
  +
  +1. Have better and clear code
  +1. Ease the maintenance and reusability
  +1. Limit the discussions about how to write and what to write in commits, comments and code
  +1. An overall better developer experience
  +
  +If you have suggestions, please see our [contribution guidelines](CONTRIBUTING.md) and feel free to make a pull request.
  +
  +---
  +
  1. Use PascalCase for file names.
  1. Use PascalCase for class and namespace names, for example: `ClassName`, `NamespaceName`
  1. Use camelCase for method names, for example: `ClassName.methodName`
  