linux: added vim

wiki/linux/vim.md

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+# VIM
+
+[VIM](https://www.vim.org/) is a highly configurable text editor.
+There are various forks off it with the most popular being [Neovim](https://neovim.io/).
+This entry only addresses VIM but due to the similarities of the forks it still can be drawn on for
+them.
+Differences of forks to the original VIM will be addressed in specific entries for the forks.
+
+## Setup
+
+The VIM program can be installed from source as described
+[on the official website/](https://www.vim.org/download.php).
+Alternatively many [Linux](/wiki/linux.md) [package managers](/wiki/linux/package_manager.md) 
+package VIM in the `vim` package.
+
+## Usage
+
+This section addresses the usage of VIM.
+
+### Manage Folding
+
+This section is based on a
+[guide from Vim From Scratch](https://www.vimfromscratch.com/articles/vim-folding).
+VIM can hide chunks of text which is called folding.
+The basic usage is as follows.
+`zf` marks a piece of text foldable and immediately folds.
+`zo` opens up a fold - so it unfolds it - and `zc` closes a fold - so it folds.