📗 update the examples' README.md

examples/README.md

@@ -1,18 +1,27 @@
 # Examples
 
-There are currently only 3 example plugins, with more to be added as requested.
-Roughly in order of which one you should go through first:
-
 - `calc`: shows how to expose your plugin's core functions to Lua;
+
 - `api`: shows how to use the `api` module to create commands, set keymaps and
   manipulate floating windows;
+
 - `mechanic`: shows how to deserialize Lua tables into Rust objects using
-  [`serde`](https://serde.rs).
+  [`serde`](https://serde.rs);
+
+- `mlua`: shows how to integrate `nvim-oxi` with the
+  [`mlua`](https://github.com/khvzak/mlua) crate;
+
+- `async`: shows how to use the `nvim_oxi::r#loop` module to trigger a callback
+  registered on the Neovim thread from other threads.
 
 The examples also include some snippets of Lua code that you can use to test
 the plugins from Neovim once you've compiled and loaded them following the
 steps below.
 
+NOTE: all the examples are compiled **without** the `nightly` feature flag,
+which means they might not work if using a nightly version of Neovim. Consider
+using the latest stable Neovim version when testing them.
+
 ## Crate setup
 
 The first step is to create a new library crate with `cargo new --lib