docs: add code_of_conduct for python sdk

docs/sdk_developers/code_of_conduct.md

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+# Code of Conduct
+
+## Overview
+
+This document outlines the expected behavior for contributors to the Python SDK.
+We aim to maintain a respectful, inclusive, and collaborative community.
+
+## Our Standards
+
+### Positive Behavior
+
+- Be respectful and considerate in communication
+- Provide constructive and professional feedback
+- Collaborate openly and help others learn
+- Stay focused on improving the project and community
+
+### Unacceptable Behavior
+
+- Harassment, discrimination, or offensive language
+- Personal attacks, trolling, or hostile behavior
+- Spamming or posting irrelevant content
+- Repeatedly ignoring maintainer guidance or contribution rules
+
+## Contribution Guidelines
+
+- Follow the project contribution workflow in [CONTRIBUTING.md](../../CONTRIBUTING.md)
+- Sign commits using both GPG and DCO (see [Quickstart Signing](../../CONTRIBUTING.md#quickstart-signing))
+- Use clear, respectful language in issues and pull requests
+- Respond to feedback constructively
+- Do not take on more issues than you can reasonably handle
+
+## Communication
+
+- Keep discussions relevant and productive
+- Ask questions when unsure
+- Be open to suggestions and improvements
+
+## Enforcement
+
+Maintainers may take action in response to behavior that violates this code, including:
+- Warning contributors
+- Limiting participation
+- Closing or removing contributions where necessary
+
+## Reference
+
+For broader community expectations, refer to the [Hiero Community Code of Conduct](https://github.com/hiero-ledger/.github/blob/main/CODE_OF_CONDUCT.md).