Explain gitignore

@redeboer Did we explain git ignore?

There are a lot of nice templates

.gitignore syntax
effect of .gitignore on untracked files
Use cases:
- Editor config files and backup (e.g. files ending in ~ by EMACS)
- Output binaries
.gitignore in subfolders

Edited Aug 12, 2020 by Florian Feldbauer

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