docs: add CHANGELOG, LICENSE, CONTRIBUTING and CODE OF CONDUCT files

CHANGELOG.md

+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+--------------------------------
+
+
+## 3.0.0-alpha.0.1.0     (unreleased)
+
+### Added
+
+### Changed
+
+#### Breaking change
+
+### Fixed
+
+### Dependancies
+
+### Security
+
+
+--------------------------------
+
+## Template
+
+```markdown
+
+## <major>.<minor>.patch_DEV     (unreleased)
+
+### Added
+
+### Changed
+
+#### Breaking change
+
+### Fixed
+
+### Dependancies
+
+### Security
+
+
+<details>
+<summary>
+
+Update `symfony/*` (v6.x.x => v6.x.x) : 0 installs, xx updates, 0 removals
+
+see: https://symfony.com/blog/
+
+</summary>
+
+Lock file operations: 0 installs, xx updates, 0 removals
+- Upgrading ...
+
+</details>
+
+
+--------------------------------
+
+```

CODE_OF_CONDUCT.md

+# 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, 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 e-mail 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 [https://adullact.org/contact](https://adullact.org/contact).
+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 2.0,
+available at <https://www.contributor-covenant.org/version/2/0/code_of_conduct.html>.
+
+Community Impact Guidelines were inspired by
+[Mozilla's code of conduct enforcement ladder](https://github.com/mozilla/diversity).
+
+For answers to common questions about this code of conduct,
+see the FAQ at <https://www.contributor-covenant.org/faq>.
+
+Translations are available at <https://www.contributor-covenant.org/translations>.
+
+[homepage]: https://www.contributor-covenant.org

CONTRIBUTING.md

+# Contributing
+
+## Versioning
+
+- All notable changes to this project will be documented in [CHANGELOG](CHANGELOG.md) file.
+- This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+    ```shell
+    MAJOR.MINOR.PATCH
+       # MAJOR ---> a breaking change: incompatible changes (ex: reorganization of directories)
+       # MINOR ---> add a new feature: a new Docker image (ex: new Asqtasun version)
+       # PATCH ---> fix a bug
+    ```
+
+## Git Commit message convention
+
+We follow [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) :
+
+```xml
+<type>[(optional scope)]: <description>
+
+[optional body]
+
+[optional footer(s)]
+```
+
+> common types:
+>
+> - `build`: changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm).
+> - `ci`: changes to the CI configuration files and scripts
+> - `chore`: update something without impacting the user (ex: bump a dependency in composer.json).
+> - `docs`: documentation only changes
+> - `feat`: add a new feature (equivalent to a `MINOR` in Semantic Versioning)
+> - `fix`: fix a bug (equivalent to a `PATCH` in Semantic Versioning).
+> - `perf`: a code change that improves performance.
+> - `refactor`: a code change that neither fixes a bug nor adds a feature.
+> - `revert`: revert a commit.
+> - `style`: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc).
+> - `test`: adding missing tests, refactoring tests; no production code change.
+
+The commit message should follow this regex:
+
+```perl
+/^(revert: )?(build|ci|chore|docs|feat|fix|perf|refactor|style|refactor|revert|style|test|)(\(.+\))?: .{1,50}/
+```