Fix #412 - Add code of conduct for OpenMetadata community

CODE_OF_CONDUCT.md

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+# OpenMetadata 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:<br>
+
+- 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 other’s 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 contact@open-metadata.org. 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**<br>
+
+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**<br>
+
+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**<br>
+
+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**<br>
+
+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](https://www.contributor-covenant.org/), version 2.1,
+available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.