Updated guide.

README.md

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 **Note: You can easily convert this markdown file to a PDF in [VSCode](https://code.visualstudio.com/) using this handy extension [Markdown PDF](https://marketplace.visualstudio.com/items?itemName=yzane.markdown-pdf).**
 
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 # Table of Contents
 
 1. [Models of Arduino boards](https://github.com/mikeroyal/Arduino-Guide/blob/main/README.md#models-of-arduino-boards)
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 6. [Rust Development](https://github.com/mikeroyal/Arduino-Guide/blob/main/README.md#rust-development)
 
 
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 # Models of Arduino boards