Update README.md

README.md

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 ## Supported Boards
 NuttX supports a wide variety of platforms. See the full list on the [Supported Platforms](https://nuttx.apache.org/docs/latest/platforms/index.html) page.
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 ## Contributing
 If you wish to contribute to the NuttX project, read the [Contributing](https://nuttx.apache.org/docs/latest/contributing/index.html) guidelines for information on Git usage, coding standard, workflow and the NuttX principles.