Add CONTRIBUTING file (#38)

* new CONTRIBUTING

* updated CONTRIBUTING

Author: bryancalisto

CONTRIBUTING

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+# CONTRIBUTING.md
+
+# Contributing to ec-sri-invoice-signed
+
+Thank you for considering contributing to this project! Contributions from the community are welcome. Please follow the guidelines if you want to contribute.
+
+## Reporting Issues
+
+If you encounter any issues or bugs, please report them by creating a new issue in the GitHub repository. Provide as much detail as possible, including:
+
+- A clear description of the issue
+- Steps to reproduce the issue
+- Any relevant screenshots or error messages
+
+## Requesting / Proposing New Features
+
+Please don't create a pull request right away. Create an issue describing the intended feature in order to check feasibility, convenience and create a plan for it. We'll derive our next actions from the issue conversation.
+
+## Submitting Pull Requests
+
+To submit a pull request, please follow these steps:
+
+1. Fork the repository.
+2. Create a new branch for your feature or bug fix.
+3. Make your changes and commit them with clear, descriptive commit messages.
+4. Push your changes to your forked repository.
+5. Open a pull request against the main repository, providing a description of your changes.
+
+## Coding Standards
+
+Please adhere to the following coding standards when contributing:
+
+- Follow the project's coding style and conventions.
+- Write clear and concise code.
+- Include comments where necessary to explain complex logic.
+- Ensure that your code passes all existing tests and add new tests if applicable.
+
+## Thank You!
+
+We appreciate your contributions and support in making this project better!