initial contributing guide

Author: russbiggs

CONTRIBUTING.md

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+# Contributing to Air Quality Index Hub (AQI Hub)
+
+Thank you for your interest in contributing to AQI Hub! This project is centered around delivering high-quality content, and we greatly appreciate contributions that help us achieve that goal. Whether you're adding new AQI documentation, correcting errors, or improving the clarity and accuracy of our existing content, your efforts are invaluable. This guide will help you understand the contribution process and the best practices for maintaining the quality and consistency of our site. Please review these guidelines before making your first contribution.
+
+## Code of Conduct
+
+Contributors must adhere to the OpenAQ [Code of Conduct](https://github.com/openaq/openaq-info/blob/main/CODE-OF-CONDUCT.md).
+
+## Style guide
+
+To ensure that all content on AQI Hub is consistent, clear, and aligns with our voice, we've put together a style guide. This guide provides key rules and recommendations for writing and formatting content. Following these guidelines will help maintain the quality and coherence of our site, making it easier for readers to engage with our material. Please take the time to review and adhere to these standards when contributing.
+
+## Markdown
+
+### Citations and References

TEMPLATE.md

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-# Country or Regulatory entity
+# Country or Regulatory entity name
 
 ## Index Name