Create CODE_OF_CONDUCT.md (subquery#400)

* Create CODE_OF_CONDUCT.md

* Update CODE_OF_CONDUCT.md

Co-authored-by: James Bayly <[email protected]>

CODE_OF_CONDUCT.md

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+# SubQuery Code of Conduct
+
+SubQuery, 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, 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:
+
+* Supporting for new contributors by providing help and pointing them to the right examples and documentation 
+* Demonstrating empathy and kindness toward other people
+* Using welcoming and inclusive language
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Focusing on what is best 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
+
+## Our Responsibilities
+
+Project maintainers 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 is deemed inappropriate, threatening, offensive,
+or harmful.
+
+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 is deemed inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies to all of SubQuery's content on GitHub, as well as at all official SubQuery 
+events, whether offline or online.
+
+Examples of representing a project or 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.
+
+## Reporting Code of Conduct Issues
+
+SubQuery encourage all communities to resolve issues on their own whenever possible. 
+This builds a broader and deeper understanding and ultimately a healthier interaction. 
+In the event that an issue cannot be resolved locally, please feel free to report your concerns by 
+contacting [email protected]. 
+
+All complaints will be reviewed and investigated promptly and fairly. SubQuery will respect the privacy and security of the reporter of any incident.
+
+All reports will be reviewed by a multi-person team and will result in a response that 
+is deemed necessary and appropriate to the circumstances. Where additional perspectives are needed, 
+the team may seek insight from others with relevant expertise or experience. The confidentiality
+of the person reporting the incident will be kept at all times. Involved parties are never part of the review team.
+
+## Attribution
+
+This Code of Conduct is adapted from version 2.0 of the [Contributor Covenant](https://www.contributor-covenant.org/version/2/0/code_of_conduct.html)
+