docs: Add vim-plug installation instructions.

doc/installation.md

@@ -180,3 +180,80 @@ MiniDeps.add({
   },
 })
 ```
+
+## vim-plug
+
+This section shows how to perform the equivalent default setup as demonstrated in the [lazy.nvim](#lazy.nvim) section using `vim-plug`.
+To install, add `blink.cmp` and its optional dependencies, then manually call `setup()` for further configuration:
+
+VimScript:
+
+```vim
+call plug#begin()
+" use a release tag to download pre-built binaries.
+" To build from source, use { 'do': 'cargo build --release' } instead
+" If you use nix, use { 'do': 'nix run .#build-plugin' }
+Plug 'saghen/blink.cmp', { 'tag': 'v1.*' }
+
+" optional: provides snippets for the snippet source
+Plug 'rafamadriz/friendly-snippets'
+call plug#end()
+
+lua << EOF
+require('blink.cmp').setup({
+  keymap = { preset = 'default' },
+  appearance = {
+    nerd_font_variant = 'mono'
+  },
+  completion = {
+    documentation = { auto_show = false }
+  },
+  sources = {
+    default = { 'lsp', 'path', 'snippets', 'buffer' },
+  },
+  fuzzy = {
+    implementation = "prefer_rust_with_warning"
+  }
+})
+EOF
+```
+
+Lua:
+
+```lua
+local Plug = vim.fn['plug#']
+
+-- Plugin installation
+vim.call('plug#begin')
+
+-- use a release tag to download pre-built binaries.
+-- To build from source, use { ['do'] = 'cargo build --release' } instead
+-- If you use nix, use { ['do'] = 'nix run .#build-plugin' }
+Plug('saghen/blink.cmp', { ['tag'] = 'v1.*' })
+
+-- optional: provides snippets for the snippet source
+Plug('rafamadriz/friendly-snippets')
+
+vim.call('plug#end')
+
+-- Plugin configuration
+require('blink.cmp').setup({
+  keymap = { preset = 'default' },
+
+  appearance = {
+    nerd_font_variant = 'mono'
+  },
+
+  completion = {
+    documentation = { auto_show = false }
+  },
+
+  sources = {
+    default = { 'lsp', 'path', 'snippets', 'buffer' },
+  },
+
+  fuzzy = {
+    implementation = "prefer_rust_with_warning"
+  }
+})
+```