docs: add onboarding code contributor guide

docs/onboarding-guide/code-contributor-guide.md

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+---
+title: AsyncAPI Code Contributor Guide
+description: A guide for new contributors looking to contribute code to the AsyncAPI project.
+weight: 90
+---
+# AsyncAPI Code Contributor Guide  
+
+Welcome to the AsyncAPI community! We're excited to have you here. Think of AsyncAPI as a collaborative puzzle - your contributions are essential to completing it. This guide will help you get started smoothly.  
+
+## Understanding AsyncAPI  
+[AsyncAPI](https://www.asyncapi.com/en) is an open-source initiative for defining and building event-driven architectures. Our repositories house tools, specifications, and generators that make event-driven systems easier to work with. Each repo has a purpose, detailed in its `README.md`.  
+
+## Prerequisites
+ Before you begin contributing code, make sure you're familiar with the following:
+
+- [Git Workflow Guide](https://github.com/asyncapi/community/blob/master/git-workflow.md): Learn how to fork, branch, commit, and open pull requests.
+- [Git](https://git-scm.com) and [GitHub](https://github.com): These are your primary tools for version control and collaboration. Learn the basics [here](https://docs.github.com/en/get-started).  
+- Code Editor: Your tool to work with the source code of our repositories and version control. For example, [VS Code](https://code.visualstudio.com), [Sublime Text](https://www.sublimetext.com), [JetBrains IDEs](https://www.jetbrains.com/ides/), or any other tool you prefer.
+- [Node.js & npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm): AsyncAPI relies on JavaScript/TypeScript, so ensure these are installed and configured.  
+
+## Contribution Etiquette  
+1. Follow the [Code of Conduct](https://github.com/asyncapi/community/blob/master/CODE_OF_CONDUCT.md)
+2. Stick to the [Contributing guidelines](https://github.com/asyncapi/community/blob/master/CONTRIBUTING.md)
+3. Document the "why" of your contribution(s). Make sure that someone who opens the code for the first time understands the changes you've made.
+4. Communicate openly through discussions on GitHub or designated Slack channels.
+
+## Submit Your First Pull Request (PR)  
+
+Once you've made and committed your changes (following the Git Workflow guide), you need to create a Pull Request (PR) to propose merging your work into the official AsyncAPI repository. Make sure to use the [conventional commit style](https://github.com/asyncapi/.github/blob/master/CONTRIBUTING.md#conventional-commits) while creating PRs and follow these steps:  
+
+### Create a Pull Request (PR)
+
+Now, go to your forked repository on GitHub (ex.- `https://github.com/your-username/generator`):
+
+1. You’ll see a notification about your recently pushed branch. Click the "Compare & pull request" button.
+2. Make sure the base repository is `asyncapi/generator` (upstream) and the head repository is your fork (`your-username/generator`).
+3. Add a clear title and description explaining your changes.
+4. Click "Create pull request" to submit your PR for review.
+
+That's it! You've successfully submitted your first Pull Request. 
+
+### Wait for Review & Merge
+- The maintainers will review your PR.
+- If needed, respond to their comments and make changes.
+- Once approved, a maintainer will merge your PR into the official AsyncAPI repository! 
+
+Every contribution matters, no matter how small. Dive in and let’s build something amazing together!