Add Code of Conduct for community guidelines

Added a Code of Conduct to outline expected and unacceptable behaviors.

Author: Pranav-MSK

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Commit-Art is an open, collaborative experiment.
+
+We are committed to providing a respectful and inclusive environment.
+
+---
+
+## Expected Behavior
+
+- Be respectful.
+- Be constructive.
+- Accept that others may overwrite your pixels.
+- Engage in creative collaboration.
+
+---
+
+## Unacceptable Behavior
+
+- Harassment or personal attacks
+- Hate speech or discriminatory symbols
+- Explicit or illegal content
+- Automated abuse or spam
+
+The maintainers reserve the right to remove content or restrict access if necessary.
+
+---
+
+## Enforcement
+
+Instances of abusive behavior may be reported by opening an issue labeled "moderation".
+
+All reports will be reviewed fairly.