After I clone repository https://github.com/wilsonmar/github-emojis
I can't figure out how to navigate above the solution folder to the root repo folder where the .gitignore and README.md files are located and be changed from.
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You can right-click on the solution and Display Options > Show All Files to view files that aren't in the solution (such as .gitignore or readme files).

You cannot browse _up_ folders from where the solution file is. Right-click and choose Reveal in Finder to view/open those files using the editor of your choice. Note that files beginning with a dot . are often hidden by default in macOS.
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You can right-click on the solution and Display Options > Show All Files to view files that aren't in the solution (such as .gitignore or readme files).
You cannot browse _up_ folders from where the solution file is. Right-click and choose Reveal in Finder to view/open those files using the editor of your choice. Note that files beginning with a dot
.are often hidden by default in macOS.