dev: add a contributing doc to the project (#45)

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Contributing Guidelines
+
+We welcome contributions from the community and are happy to have them.
+Please follow this guide when logging issues or making changes.
+
+## Installation
+
+To install the package, you can check [this documentation](README.md#installation).
+
+## Testing
+
+We use `pytest` for testing. To run the tests, you can use the following command:
+
+```bash
+pytest
+```
+
+## Reporting a bug
+
+If you find a bug in this project, you can report it by opening an issue via this
+[link](https://github.com/hussein-awala/spark-on-k8s/issues/new) and providing all the
+information can help reproduce it.
+If you already have a fix for the bug, you can skip creating an issue and submit a PR to fix it.
+
+**Warning**: if the bug is a security vulnerability, please follow
+[this documentation](SECURITY.md#reporting-a-vulnerability) to report it.
+
+## Questions
+
+If you have any question, a new idea, or anything to discuss, you can start a new discussion
+via this [link](https://github.com/hussein-awala/spark-on-k8s/discussions/new/choose).