docs: add CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Standard
+
+This project should be a respectful, constructive place to discuss code, design decisions, issues,
+and improvements. Contributions and conversations are expected to be professional, specific, and
+generous in intent.
+
+Examples of positive behavior include:
+
+- giving feedback that is clear, actionable, and focused on the work;
+- assuming good intent while still naming problems directly;
+- welcoming questions from people with different experience levels;
+- crediting ideas, reports, and contributions accurately;
+- disagreeing without making the conversation personal.
+
+Examples of unacceptable behavior include:
+
+- harassment, insults, threats, or discriminatory language;
+- sexualized language or imagery in project spaces;
+- personal attacks, trolling, or repeated disruptive comments;
+- publishing private information without explicit permission;
+- pressuring maintainers or contributors outside the scope of the project.
+
+## Scope
+
+This code of conduct applies to project spaces such as issues, pull requests, discussions, commits,
+reviews, and any other forum used to coordinate work on this repository. It also applies when someone
+is representing the project in public.
+
+## Reporting
+
+If you notice behavior that violates this code of conduct, please contact the maintainer privately.
+Include the relevant context, links, screenshots, or timestamps when possible so the report can be
+reviewed fairly.
+
+Reports will be handled with care and discretion. The goal is to protect contributors, keep the
+project healthy, and respond proportionally to the situation.
+
+## Enforcement
+
+The maintainer may take any action needed to keep the project environment constructive, including:
+
+- clarifying expectations in a thread;
+- editing or removing inappropriate comments;
+- closing or locking conversations;
+- declining contributions;
+- limiting or blocking future participation.
+
+Enforcement decisions are based on the behavior, its impact, and the needs of the project community.
+
+## Attribution
+
+This code of conduct is adapted from common open source community standards and tailored for this
+repository.