📝 docs: add CONTRIBUTING.md to provide guidelines for potential contr…

…ibutors

This commit adds a CONTRIBUTING.md file to the project. This file provides guidelines for potential contributors, including how to get started, how to make a contribution, how to report bugs, and how to suggest enhancements. It also includes a link to the project's Code of Conduct.

CONTRIBUTING.md

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+# Contributing to colissimo-pickup-point
+
+First off, thank you for considering contributing to colissimo-pickup-point! It's people like you that make the open source community such a great community!
+
+## Getting started
+
+Before you begin:
+
+- Ensure you have installed the latest version of [Node.js](https://nodejs.org/en/).
+- Read the documentation and familiarize yourself with the project.
+
+## How to make a contribution
+
+### Fork the Repository
+
+Create your own fork of the code.
+
+### Create a Branch
+
+Create a branch in your fork for your changes.
+
+### Make Your Changes
+
+Make your changes and commit them to your branch. Be sure to write detailed commit messages and follow any coding conventions already in place.
+
+### Write or Adapt Tests
+
+If you're adding new functionality, please include tests that cover the new code.
+If you're fixing a bug, consider adding a test that would have caught the bug.
+
+### Run the Tests
+
+Ensure the full test suite passes after your changes.
+
+### Lint Your Code
+
+Make sure your changes adhere to any linter rules that are set up.
+
+### Send a Pull Request
+
+Push your branch to your fork and open a pull request against the main repository.
+Clearly describe the problem and solution. Include the relevant issue number if applicable.
+
+### Review Process
+
+The maintainers of the project will review your changes. Be open to feedback and any requests for modifications.
+
+## Reporting Bugs
+
+- Use the issue tracker to report bugs.
+- Describe the bug and include specific details to help us understand the problem.
+- Include steps to reproduce the issue.
+
+## Suggesting Enhancements
+
+- Use the issue tracker to suggest enhancements.
+- Describe your idea and how it would benefit the project.
+
+## Code of Conduct
+
+Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.