docs: add CONTRIBUTING.md

Author: anasstahr

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in this project! This project is not accepting external contributions at this time. Please feel free to open issues for bug reports and feature requests.
+
+## Table of Contents
+
+- [Reporting Bugs](#reporting-bugs)
+- [Feature Requests](#feature-requests)
+- [Local Development](#local-development)
+- [Publishing your Change](#publishing-your-change)
+- [Security](#security)
+
+## Reporting Bugs
+
+- Before reporting bugs, please make sure you are on the latest version.
+- Go through existing issues and check no users have reported the same bug.
+- Submit a [GitHub Issue](https://github.com/aws/agent-toolkit-for-aws/issues/new?template=bug_report.yml) with detailed steps on how to reproduce this bug, as well as your system information such as your AI assistant (Claude Code, Codex, Kiro, etc.), its version, and operating system.
+
+## Feature Requests
+
+- Before submitting a feature request, please make sure you are on the latest version.
+- Go through existing issues and check no users have requested the same feature.
+- Submit a [GitHub Issue](https://github.com/aws/agent-toolkit-for-aws/issues/new?template=feature_request.yml) with a clear description of the feature and your use case.
+
+## Local Development
+
+1. Clone the repository:
+
+   ```bash
+   git clone https://github.com/aws/agent-toolkit-for-aws.git
+   cd agent-toolkit-for-aws
+   ```
+
+2. Install [Mise](https://mise.jdx.dev/) and trust the repo config:
+
+   ```bash
+   mise trust
+   mise install
+   ```
+
+3. Run the full build (lint + validate + security):
+
+   ```bash
+   mise run build
+   ```
+
+## Publishing your Change
+
+1. Create a new branch from `main`:
+
+   ```bash
+   git checkout main
+   git pull origin main
+   git checkout -b feat/your-feature-name
+   ```
+
+2. Make your changes and validate:
+
+   ```bash
+   mise run build
+   ```
+
+3. Commit and push:
+
+   ```bash
+   git add .
+   git commit -m "feat: add descriptive commit message"
+   git push -u origin feat/your-feature-name
+   ```
+
+4. Open a pull request against `main` using the [PR template](.github/pull_request_template.md).
+
+## Security
+
+If you discover a potential security issue, please notify AWS/Amazon Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public GitHub issue.