docs: add installation steps (#160)

README.md

@@ -2,10 +2,64 @@
 
 Syntax and indent files for [Swift](https://developer.apple.com/swift/)
 
-If you don't have a preferred installation method check out
-[vim-plug](https://github.com/junegunn/vim-plug).
+## Features
+
+- Syntax highlighting for modern Swift
+- Filetype detection
+- Smart indentation
+- Compiler usage (`:compiler swiftc` → `:make`)
 
 ## Examples
 
 ![](https://raw.githubusercontent.com/keith/swift.vim/master/screenshots/screen.png)
 ![](https://raw.githubusercontent.com/keith/swift.vim/master/screenshots/screen2.png)
+
+## Installation
+
+### [LazyVim](https://www.lazyvim.org/)
+
+> For [neovim](https://github.com/neovim/neovim) only
+
+1. Locate your [plugins folder](https://www.lazyvim.org/configuration/plugins#-adding-plugins), make a new `.lua` file and name it `swift.lua`
+
+2. add the following:
+
+```lua
+return {
+  "keith/swift.vim",
+  ft = "swift",  -- filetype
+}
+```
+
+The plugin should be automatically installed next time you start nvim!
+
+> [!TIP]
+> usual location for the plugins is `~/.config/nvim/lua/plugins/`)
+
+### [Plug](https://github.com/junegunn/vim-plug)
+
+1. Add the folowing to your vim-plug block:
+
+```vim
+Plug 'keith/swift.vim', { 'for': 'swift' }
+```
+
+2. Run `:PlugInstall`:
+
+### [Packer](https://github.com/wbthomason/packer.nvim)
+
+1. Add the following to your packer config:
+
+```lua
+require('packer').startup(function(use)
+  use { 'keith/swift.vim', ft = 'swift' }
+end)
+```
+
+## Usage
+
+Opening any `.swift` file should automatically enable the plugin.
+
+##### Commands
+
+- Run `:compiler swiftc` then `:make` to build current file.