Create CONTRIBUTING.md

Author: krook

CONTRIBUTING.md

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+## Contributing In General
+Our project welcomes external contributions! If you have an itch, please feel free to scratch it.
+
+To contribute code or documentation, please submit a pull request to the [GitHub repository](https://github.com/IBM/drupal-nginx-php-kubernetes).
+
+A good way to familiarize yourself with the codebase and contribution process is to look for and tackle low-hanging fruit in the [issue tracker](https://github.com/IBM/drupal-nginx-php-kubernetes/issues). Before embarking on a more ambitious contribution, please quickly [get in touch](#communication) with us.
+
+**We appreciate your effort, and want to avoid a situation where a contribution requires extensive rework (by you or by us), sits in the queue for a long time, or cannot be accepted at all!**
+
+### Proposing new features
+
+If you would like to implement a new feature, please [raise an issue](https://github.com/IBM/drupal-nginx-php-kubernetes/issues) before sending a pull request so the feature can be discussed.
+This is to avoid you spending your valuable time working on a feature that the project developers are not willing to accept into the code base.
+
+### Fixing bugs
+
+If you would like to fix a bug, please [raise an issue](https://github.com/IBM/drupal-nginx-php-kubernetes/issues) before sending a pull request so it can be discussed.
+If the fix is trivial or non controversial then this is not usually necessary.
+
+### Merge approval
+
+The project maintainers use LGTM (Looks Good To Me) in comments on the code review to
+indicate acceptance. A change requires a LGTMs from one of the maintainers.
+
+For more details, see the [MAINTAINERS](MAINTAINERS.md) page.
+
+## Setup
+Please add any special setup instructions for your project to help the developer become productive quickly.
+
+## Testing
+Please provide information that helps the developer test any changes they make before submitting.
+
+## Coding style guidelines
+Beautiful code rocks! Please share any specific style guidelines you might have for your project.