Added resources for session 2

nih-fmrif · Dec 12, 2019 · f4cbbae · f4cbbae
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 * GitHub Documentation Tutorial: https://guides.github.com/features/wikis/
 
+* Differences between various `git add ` flags: https://stackoverflow.com/questions/572549/difference-between-git-add-a-and-git-add
 
+* More on .gitignore: 
+  * https://guide.freecodecamp.org/git/gitignore/
+  * https://git-scm.com/docs/gitignore
+
+* .gitignore templates for various programming languages and operating systems: https://github.com/github/gitignore