docs: provide example for nvim < 0.9.0 plugin version configuration

Author: jmbuhr

README.md

@@ -2,8 +2,6 @@
 
 Quarto-nvim provides tools for working on [quarto](https://quarto.org/) manuscripts in Neovim.
 
-Quarto-nvim requires Neovim >= **v0.9.0** (https://github.com/neovim/neovim/releases/tag/stable).
-
 ## Setup
 
 You can install `quarto-nvim` from GitHub with your favourite Neovim plugin manager
@@ -30,6 +28,22 @@ Plugins and their configuration to look out for in this file are:
 }
 ```
 
+Quarto-nvim requires Neovim >= **v0.9.0** (<https://github.com/neovim/neovim/releases/tag/stable>).
+If you are unable to update Neovim, you can specify a specific version of the plugins
+involved instead of the latest stable version.
+How you do this will vary depending on your plugin manager, but you can see one example using `lazy.nvim` here:
+<https://github.com/jmbuhr/quarto-nvim-kickstarter/blob/nvim-0.8.3/lua/plugins/quarto.lua>
+
+The `version = ...` lines to look out for are for the following plugins:
+
+```lua
+{
+    'quarto-dev/quarto-nvim',
+    'jmbuhr/otter.nvim',
+    'nvim-treesitter/nvim-treesitter'
+}
+```
+
 ## Usage
 
 ### Configure

plugin/quarto.lua

@@ -1,6 +1,11 @@
 if vim.fn.has("nvim-0.9.0") ~= 1 then
   local msg =
-  [[quarto-dev/quarto-nvim and jmbuhr/otter.nvim require Neovim version >= 0.9.0 (https://github.com/neovim/neovim/releases/tag/stable). Please upgrade to get access to the latest features and performance improvements.]]
+  [[
+  quarto-dev/quarto-nvim and jmbuhr/otter.nvim require Neovim version >= 0.9.0 (https://github.com/neovim/neovim/releases/tag/stable).
+  If you are unable to update Neovim, you can specify a specific version of the plugins involved instead of the latest stable version.
+  How you do this will vary depending on your plugin manager, but you can see one example using `lazy.nvim` here:
+  <https://github.com/jmbuhr/quarto-nvim-kickstarter/blob/nvim-0.8.3/lua/plugins/quarto.lua>
+  ]]
   local displayed = vim.notify_once(msg, vim.log.levels.WARN)
   if displayed then
     return msg