Add CODE_OF_CONDUCT file

CODE_OF_CONDUCT.md

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+# Kalulu Code of Conduct
+
+## Our Promise
+
+The Kalulu community is here to learn, create, and share together.  
+We promise to treat everyone with kindness and respect, whether they are a beginner, an experienced developer, a teacher, a parent, or a young learner.
+
+We believe in curiosity, patience, and helping each other grow.
+
+## How We Work Together
+
+Here’s what makes our community a happy and safe place:
+
+- Use friendly and encouraging language
+- Listen to others and value their ideas
+- Share knowledge and help each other solve problems
+- Be patient when someone is learning something new
+- Remember that mistakes are part of learning
+
+## What We Avoid
+
+To keep Kalulu a safe space for everyone, we don’t allow:
+
+- Mean or hurtful words
+- Making fun of someone’s questions or skills
+- Bullying or harassing others
+- Sharing private information without permission
+- Anything that makes the community feel unsafe
+
+## Where This Applies
+
+This Code of Conduct applies in all Kalulu spaces:
+- On GitHub (issues, pull requests, discussions)
+- In chat rooms or community meetings
+- Any time someone represents the Kalulu project
+
+## If Something Feels Wrong
+
+If you see or experience something that goes against these guidelines:
+- You can tell a project maintainer or send an email to developer@excellolab.org: [Report an issue](mailto:developer@excellolab.org?subject=Kalulu%20Code%20of%20Conduct%20Report&body=Describe%20your%20concern%20here...)
+- Your concern will be listened to carefully and taken seriously
+- We will work together to find a fair solution
+
+## Why This Matters
+
+Kalulu is an educational project that exists to make learning joyful.  
+By being kind, respectful, and supportive, we make sure everyone feels welcome to join in and contribute.
+
+---
+
+Inspired by the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1, adapted for an educational community.