Add Contributing and Code of Conduct

Author: loicgreffier

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, caste, color, religion, or sexual
+identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall
+  community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or advances of
+  any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email address,
+  without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official email address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+the contact form available at
+[https://opensource.michelin.io](https://opensource.michelin.io)
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of
+actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or permanent
+ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior, harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the
+community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+Community Impact Guidelines were inspired by
+[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
+
+For answers to common questions about this code of conduct, see the FAQ at
+[https://www.contributor-covenant.org/faq][FAQ]. Translations are available at
+[https://www.contributor-covenant.org/translations][translations].
+
+[homepage]: https://www.contributor-covenant.org
+
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
+
+[Mozilla CoC]: https://github.com/mozilla/diversity
+
+[FAQ]: https://www.contributor-covenant.org/faq
+
+[translations]: https://www.contributor-covenant.org/translations

CONTRIBUTING.md

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+# Contributing to Kafka Streams Processing Error Handling
+
+Welcome to our contribution guide.
+This guide will help you understand the process and expectations for contributing.
+
+## Getting Started
+
+### Issues
+
+If you want to report a bug, request a feature, or suggest an improvement, please open an issue on the [GitHub repository](https://github.com/michelin/kafka-streams-processing-error-handling/issues)
+and fill out the appropriate template.
+
+If you find an existing issue that matches your problem, please:
+- Add your reproduction details to the existing issue instead of creating a duplicate.
+- Use reactions (e.g., 👍) on the issue to signal that it affects more users. [GitHub reactions](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) help maintainers prioritize issues based on user impact.
+
+If no open issue addresses your problem, please open a new one and include:
+- A clear title and detailed description of the issue.
+- Relevant environment details (e.g., version, OS, configurations).
+- A code sample or executable test case demonstrating the expected behavior that is not occurring.
+
+### Pull Requests
+
+To contribute to Kafka Streams Processing Error Handling:
+
+- Fork the repository to your own GitHub account
+- Clone the project to your machine
+- Create a branch from the `main` branch
+- Make your changes and commit them to your branch
+- Push your changes to your fork
+- Open a merge request to the `main` branch of the Kafka Streams Processing Error Handling repository so that we can review your changes
+
+## Style Guide
+
+We maintain a consistent code style using [Spotless](https://github.com/diffplug/spotless/tree/main/plugin-maven).
+For Java code, we follow the [Palantir](https://github.com/palantir/palantir-java-format) style.
+
+To check for formatting issues, run:
+
+```bash
+mvn spotless:check
+```
+
+To automatically fix formatting issues and add missing file headers, run:
+
+```bash
+mvn spotless:apply
+```