Add README for Vim support

etc/vim/README.md

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+# HLDS support in Vim
+
+Add syntax highlighting for HLDS, the Haldis Language for Describing Servings, to your editor!
+
+## Installation
+
+Install these files as
+
+* `ftdetect/hlds.vim`
+* `ftplugin/hlds.vim`
+* `syntax/hlds.vim`
+* `indent/hlds.vim`
+
+in your Vim runtime directory.
+
+For example if you're using a *NIX such as Linux or macOS:
+```sh
+for kind in ftdetect ftplugin syntax indent; do
+	mkdir -p ~/.vim/$kind
+	cp $PWD/$kind.vim ~/.vim/$kind/hlds.vim
+done
+```
+
+If you use [Neovim](https://neovim.io/) instead of Vim:
+```sh
+for kind in ftdetect ftplugin syntax indent; do
+	mkdir -p ~/.config/nvim/$kind
+	cp $PWD/$kind.vim ~/.config/nvim/$kind/hlds.vim
+done
+```
+
+If you want to use the latest version, you can create symlinks instead of copying by substituting
+`ln -s` for `cp`.
+
+Restart Vim to enable support for HLDS.

etc/vim/indent.vim

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+" This file will be populated in the future