Update README.md

Author: pqz317

README.md

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 ## Intro
 Welcome to the Git/Github tutorial repository! We will use this repo to store tutorials on Git/Github
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+Outside of these tutorials, there are a few other resources worth mentioning if you're interested:
+- Atlassian has a series of Git tutorials: https://www.atlassian.com/git/tutorials they're not Github-based, but concepts are the same. Their "Comparing Workflows" Section was an especially useful reference for creating these tutorials. 
+- Please add any additional resources here!