Add documentation

Author: tessarin

README.md

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+# vim-minima
+
+Vim support for the [Minima](https://github.com/tessarin/minima) web
+framework.
+
+## Features
+
+This plugin provides:
+
+- Syntax highlighting for route files.
+- Automatic filetype detection when the filename is _routes.map_.
+
+More features may be added in the future.
+
+## Installation
+
+See [`:h packages`][1]. Example setup using the `plugins` package and
+automatic loading:
+
+```sh
+mkdir -p ~/.vim/pack/plugins/start
+git clone https://github.com/tessarin/vim-minima !$/minima
+```
+
+[1]: https://vimhelp.org/repeat.txt.html#packages