[DOC]: Add community governance guidelines (#754)

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to make participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers 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, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community includes using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting [email protected], which is a shared team inbox. If the incident involves someone who receives that shared inbox, you can contact an individual maintainer @qishipengqsp at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [https://contributor-covenant.org/version/1/4][version]
+
+[homepage]: https://contributor-covenant.org
+[version]: https://contributor-covenant.org/version/1/4/

community/CONTRIBUTING.md

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+# Contributing to TuGraph DB
+
+Thank you for considering contributing to TuGraph DB! We welcome contributions from the community and are grateful for your support.
+
+## How to Contribute
+
+### 1. Fork the Repository
+Fork the repository to your own GitHub account by clicking the "Fork" button at the top right of the repository page.
+
+### 2. Clone the Repository
+Clone the forked repository to your local machine:
+```bash
+git clone https://github.com/TuGraph-family/tugraph-db.git
+cd tugraph-db
+```
+
+### 3. Create a Branch
+Create a new branch for your feature or bugfix:
+```bash
+git checkout -b my-feature-branch
+```
+
+### 4. Make Changes
+Make your changes to the codebase. Ensure your code follows the project's coding standards and includes appropriate tests.
+
+### 5. Commit Changes
+Commit your changes with a clear and concise commit message:
+```bash
+git add .
+git commit -m "Description of your changes"
+```
+
+### 6. Push Changes
+Push your changes to your forked repository:
+```bash
+git push origin my-feature-branch
+```
+
+### 7. Create a Pull Request
+Create a pull request from your forked repository to the main repository. Provide a detailed description of your changes and any relevant information.
+
+### 8. Review Process
+Your pull request will be reviewed by the project maintainers. Please be responsive to any feedback or requests for changes.
+
+## Code of Conduct
+Please adhere to our [Code of Conduct](../CODE_OF_CONDUCT.md) in all your interactions with the project.
+
+## Additional Resources
+- [Issue Tracker](https://github.com/TuGraph-family/tugraph-db/issues)
+- [Project Documentation](../docs)
+
+Thank you for your contributions!

community/ROLES.md

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+# Roles and Responsibilities
+
+## Project Roles
+
+### Project Management Committee (PMC)
+- **Description**: The PMC is responsible for the overall management and oversight of the project.
+- **Responsibilities**:
+    - Ensure the project adheres to the Apache Way.
+    - Make decisions regarding project direction and policies.
+    - Manage releases and ensure quality standards are met.
+    - Handle legal and licensing issues.
+
+### Committers
+- **Description**: Committers are contributors who have earned the right to commit code directly to the project repository.
+- **Responsibilities**:
+    - Review and commit code contributions from the community.
+    - Maintain the project's codebase and documentation.
+    - Mentor new contributors and facilitate their integration into the project.
+    - Ensure contributions adhere to project guidelines and standards.
+
+### Contributors
+- **Description**: Contributors are individuals who contribute to the project by submitting patches, documentation, or other improvements.
+- **Responsibilities**:
+    - Submit patches and improvements via pull requests.
+    - Participate in discussions and provide feedback on issues and proposals.
+    - Follow the project's contribution guidelines and coding standards.
+    - Engage with the community and assist other contributors.
+
+### Users
+- **Description**: Users are individuals or organizations that use the project.
+- **Responsibilities**:
+    - Provide feedback and report issues.
+    - Participate in the community by asking questions and sharing experiences.
+    - Contribute to the project's documentation and knowledge base.
+
+## The Apache Way
+
+The project follows the principles of the Apache Way, which include:
+- **Community Over Code**: Prioritizing a healthy and vibrant community over the code itself.
+- **Meritocracy**: Recognizing and rewarding contributions based on merit.
+- **Openness**: Conducting all project discussions and decisions in public forums.
+- **Consensus**: Striving for consensus in decision-making processes.
+
+For more information on the Apache Way, please refer to the [Apache Software Foundation](https://www.apache.org/foundation/how-it-works.html).