docs: Add governance documentation

- Add GOVERNANCE.md documenting technical governance structure
- Add CODEOWNERS file defining project maintainers
- Add CODE_OF_CONDUCT.md referencing Linux Foundation CoC
- CoC changes require approval from all maintainers

These files are required for PyTorch Ecosystem membership.

Author: PierreQuinton

.github/CODEOWNERS

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+# These owners will be the default owners for everything in the repo.
+*       @ValerianRey @PierreQuinton

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+TorchJD follows the [Linux Foundation Code of Conduct](https://lfprojects.org/policies/code-of-conduct/).
+
+## Changes to this Code of Conduct
+
+Changes to this Code of Conduct require approval from all maintainers.

GOVERNANCE.md

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+# TorchJD Governance
+
+This document defines the governance structure and decision-making process for the TorchJD project.
+
+## Maintainers
+
+TorchJD is maintained by:
+
+- **Valérian Rey** ([@ValerianRey](https://github.com/ValerianRey))
+- **Pierre Quinton** ([@PierreQuinton](https://github.com/PierreQuinton))
+
+Maintainers are responsible for:
+- Reviewing and merging pull requests
+- Managing releases
+- Setting project direction and priorities
+- Ensuring code quality and consistency
+
+## Decision Making
+
+### Technical Decisions
+
+Most technical decisions are made through the pull request process:
+
+1. **Minor changes** (bug fixes, documentation, small improvements): Require approval from at least one maintainer
+2. **Significant changes** (new features, API changes, refactoring): Should be discussed in an issue first, then require approval from at least one maintainer
+3. **Major changes** (breaking changes, architectural decisions): Should be discussed in an issue or discussion thread and require consensus from all maintainers
+
+### Pull Request Process
+
+1. Contributors submit pull requests following the guidelines in [CONTRIBUTING.md](CONTRIBUTING.md)
+2. Maintainers review the code for correctness, style, and alignment with project goals
+3. Once approved, any maintainer can merge the pull request
+4. All pull requests must pass CI checks before being merged
+
+### Consensus
+
+For major decisions, maintainers aim for consensus. If consensus cannot be reached:
+- The decision may be postponed for further discussion
+- If a decision must be made, the maintainer with the most relevant expertise in the area makes the final call
+
+## Release Process
+
+Releases are managed by maintainers following the process described in [CONTRIBUTING.md](CONTRIBUTING.md):
+
+1. Ensure all tests pass
+2. Update the changelog
+3. Update the version number
+4. Create a release on GitHub
+5. Verify deployment to PyPI
+
+## Adding Maintainers
+
+New maintainers may be added when:
+- They have made significant, sustained contributions to the project
+- They demonstrate understanding of the project's goals and coding standards
+- They are committed to the long-term maintenance of the project
+
+New maintainers must be approved by all existing maintainers.
+
+## Conflict Resolution
+
+Conflicts are resolved through discussion:
+1. Issues should first be discussed in the relevant issue or pull request
+2. If unresolved, maintainers discuss privately to reach consensus
+3. The goal is always to find the best solution for the project and its users
+
+## Code of Conduct
+
+This project follows the [Linux Foundation Code of Conduct](https://lfprojects.org/policies/code-of-conduct/).
+
+## Changes to Governance
+
+Changes to this governance document require approval from all maintainers.