feat: add contributing docs (#222)

* feat: add contributing docs

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* apply suggestion

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome through GitHub pull request. This document outlines the steps to facilitate the acceptance of your contribution.
+
+## How to Contribute
+
+1. Fork repository, develop, and test your changes.
+2. Bump the chart version and update chart documentation.
+3. Submit a pull request.
+
+To simplify testing and merging, please submit changes for only one chart per pull request.
+
+### Technical Requirements
+
+* Must follow [charts best practices](https://helm.sh/docs/topics/chart_best_practices/).
+* Must pass CI jobs for linting and installing changed charts with the [chart-testing](https://github.com/helm/chart-testing) tool.
+* Any change to a chart requires a version bump following [semver](https://semver.org/) principles. See [Immutability](#immutability) and [Versioning](#versioning) below.
+
+Once changes have been merged, the release job will automatically run to package and release changed charts.
+
+### Immutability
+
+Chart releases must be immutable. Any change to a chart, including documentation updates, requires bumping the chart version.
+
+### Versioning
+
+Version numbers follow [semantic versioning](https://semver.org/). When making changes to a chart, update the version in `Chart.yaml` as follows:
+
+- MAJOR version (x.0.0): Incompatible API changes
+  * Breaking changes to values.yaml structure.
+  * Removal of deprecated features.
+  * Major Kubernetes version requirement changes.
+
+- MINOR version (0.x.0): Added functionality in a backward compatible manner
+  * New optional parameters or features.
+  * New capabilities that maintain backward compatibility.
+
+- PATCH version (0.0.x): Backward compatible bug fixes or documentation updates
+  * Bug fixes that don't change the chart's functionality.
+  * Documentation improvements.
+  * Minor clarifications or corrections.
+
+### Generate documentation
+
+Documentation for charts is automatically generated from the following sources:
+- Chart.yaml: Metadata and version information.
+- values.yaml: Configuration options and defaults.
+- README.md.gotmpl: Template for the chart's README.
+
+To regenerate documentation after making changes:
+
+```shell
+make docs
+```
+
+### Community Requirements
+
+This project is released with a [Contributor Covenant](https://www.contributor-covenant.org).
+By participating in this project you agree to abide by its terms.
+See [CODE_OF_CONDUCT.md](./CODE_OF_CONDUCT.md).