docs: add Code of Conduct (JetBrains-style)

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+This Code of Conduct outlines our expectations for all those who participate in
+the Sharingan open source project and community, as well as the consequences for
+unacceptable behaviour. We invite all those who participate to help us create
+safe and positive experiences for everyone. Communities mirror the societies in
+which they exist, and positive action is essential to counteract the many forms
+of inequality and abuses of power that exist in society.
+
+## How to behave
+
+The following behaviours are expected and requested of all community members:
+
+* Participate in an authentic and active way. In doing so, you contribute to the
+  health and longevity of this community.
+* Exercise consideration, respect and empathy in your speech and actions.
+  Remember, we have all been through different stages of learning when adopting
+  technologies.
+* Refrain from demeaning, discriminatory, or harassing behaviour and speech.
+* Disagreements on things are fine; argumentative behaviour or trolling are not.
+
+## How not to behave
+
+* Do not perform threats of violence or use violent language directed against
+  another person.
+* Do not make jokes of a sexist, racist, homophobic, transphobic, ableist or
+  otherwise discriminatory nature, or use language of this nature.
+* Do not post or display sexually explicit or violent material.
+* Do not post or threaten to post other people's personally identifying
+  information ("doxing").
+* Do not make personal insults, particularly those related to gender, sexual
+  orientation, race, religion, or disability.
+* Do not engage in unwelcome sexual attention. This includes sexualised comments
+  or jokes and sexual advances.
+* Do not advocate for, or encourage, any of the above behaviour.
+
+Please take into account that online communities bring together people from many
+different cultures and backgrounds. It's important to understand that sometimes
+the combination of cultural differences and online interaction can lead to
+misunderstandings. That is why having empathy is very important.
+
+## How to report issues
+
+If someone is acting inappropriately or violating this Code of Conduct in any
+shape or form, and they are not receptive to your feedback or you prefer not to
+confront them, please reach out to the project maintainers at
+**mibrahim.dev@gmail.com**. All reports will be handled with discretion and
+reviewed as promptly as possible.
+
+## Consequences of unacceptable behaviour
+
+Unacceptable behaviour from any community member will not be tolerated. Anyone
+asked to stop unacceptable behaviour is expected to comply immediately. If a
+community member engages in unacceptable behaviour, the project maintainers may
+take any action they deem appropriate, up to and including a temporary ban or
+permanent expulsion from the community without warning.
+
+## License and attribution
+
+This Code of Conduct is adapted from the Code of Conduct used across
+[JetBrains open source projects](https://github.com/JetBrains#code-of-conduct),
+which is itself based on the
+[Citizen Code of Conduct](http://citizencodeofconduct.org/), distributed by
+[Stumptown Syndicate](http://stumptownsyndicate.org/) under a
+[Creative Commons Attribution-ShareAlike](https://creativecommons.org/licenses/by-sa/3.0/)
+license.