docs: adding CONTRIBUTING.md (#627)

* docs: adding CONTRIBUTING.md

* Update CONTRIBUTING.md

Co-authored-by: Jordi Giménez <[email protected]>

* Update CONTRIBUTING.md

Co-authored-by: Jordi Giménez <[email protected]>

* Update CONTRIBUTING.md

Co-authored-by: Jordi Giménez <[email protected]>

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Co-authored-by: Jordi Giménez <[email protected]>

CONTRIBUTING.md

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+# Contributing to Issuer Node
+
+Welcome to Issuer Node! We're thrilled to have you here. Before you get started, please take a moment to review the following guidelines.
+
+### Contents
+
+- [How to Contribute](#how-to-contribute)
+- [Getting Started](#getting-started)
+- [Issue Tracker Guidelines](#issue-tracker-guidelines)
+- [Code Contribution Guidelines](#code-contribution-guidelines)
+- [Testing Guidelines](#testing-guidelines)
+- [Documentation](#documentation)
+- [License Information](#license-information)
+- [Contact Information](#contact-information)
+
+## How to Contribute
+
+**Reporting Issues**: If you encounter any bugs or have suggestions for improvements, please open an issue on GitHub. If the bug is a security vulnerability, please report it directly [here](https://support.polygon.technology/support/solutions/categories/82000473421/folders/82000694808).
+
+**Requesting Features**: If you have ideas for new features or enhancements, please submit a feature request on GitHub.
+
+**Submitting Changes**: Fork the repository, make your changes, and submit a pull request. Be sure to follow the guidelines outlined below.
+
+## Getting Started
+
+To set up the project locally, follow the [README](./README.md#quick-start-installation) instructions.
+
+For an advanced setup, visit our [extended documentation](https://devs.polygonid.com/docs/issuer/issuer-configuration).
+
+## Issue Tracker Guidelines
+
+Search for existing issues before creating new ones.
+
+Provide detailed information and steps to reproduce when reporting bugs.
+
+Follow the issue template if available.
+
+## Code Contribution Guidelines
+Before submitting a contribution, please consider whether it will be useful to the community and try to minimise breaking changes.  In general, a Pull Request with breaking changes is unlikely to be accepted immediately.
+Submit concise and focused pull requests with clear descriptions.
+
+Follow the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) specification both for the commits and PR names.
+
+Use develop as the base and target branch for pull requests.
+
+Be responsive to feedback and address any review comments promptly.
+
+## Testing Guidelines
+
+Write tests for new features or changes 
+
+Ensure all existing tests pass and the linter reports no errors before submitting your changes.
+
+Run tests and linter locally with:
+``` bash
+make up-test // To start the database used by tests
+make tests // run all tests
+make lint // run linter
+``` 
+
+## Documentation
+
+Keep documentation up-to-date with any changes or additions.
+Help improve existing documentation or contribute new documentation as needed.
+
+## License Information
+
+By contributing to this project, you agree to the terms of licenses [Apache](LICENSE-APACHE) and [Mit](LICENSE-MIT).
+
+## Contact Information
+
+If you have any questions or need assistance, feel free to contact the project maintainers [here](https://support.polygon.technology/support/solutions/categories/82000473421/folders/82000694808).