Code Trees - showing in GitHub.com respository
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Code Tree = hierarchical display of directory/file structure of project
OPTION1: Install one of the many free tools (extensions to github that are browser specific)
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search to find your own ("github and code tree display plugin/extension") or try out one I use called OctoTree (this is the link for Chrome but, I believe it has versions for other browsers). Below you can see it in action. Notice it lets you actually navigate around github much as you may do on your personal desktop. Great tool.
OPTION 2: ONLY if you can NOT get option 1 working do I want you to even consider this "weak" substitution
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again only if you can't get a plugin working (and this should NOT be the case) can you simply navigate INTO the code inside of the github.com interface and do a screenshot that "WEAKLY" demonstrates there is a hierarchy of code (code tree) going on.