add RStudio project file

[zkamvar]

This adds an RStudio project file to the lesson. It is recommended to make it easier for RStudio users to contribute. This supersedes #238

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/genomics-r-intro/compare/md-outputs..md-outputs-PR-239

The following changes were observed in the rendered markdown documents:

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⏱️ Updated at 2023-09-25 18:31:16 +0000