chore: updating readme instructions for config settings

README.md

@@ -80,6 +80,8 @@ to your liking.
 - The `completion` field controls which completion engine is used for account and
   commodities completion. Right now, we only support nvim-cmp, but this will expand
   soon. You can disable completion by setting the enabled value to false.
+  - Note: if you enable completion through nvim-cmp, you must have nvim-cmp installed
+    and available.
 - The `snippets` field defines which snippet engine you want to use. Currently, we
   support native, cmp, and luasnip, with cmp being the default.
   - `cmp`: This sets up snippets as a completion source in nvim-cmp, offering snippet
@@ -88,6 +90,7 @@ to your liking.
     the keymaps field. It’s a bit clunky, but it’s an option if you prefer it.
   - `luasnip`: This integrates with luasnip to add snippets to Ledger files. It also
     works smoothly alongside nvim-cmp.
+    - Note: this requires luasnip to be installed and available.
 - The `keymaps` field defines key mappings for different parts of the plugin:
   - The `snippets` section defines keymaps or triggers for snippets. If you're using
     native as your snippet engine, this will set the actual keymap in Neovim. You can