Add a readme section on plugin formats

README.md

@@ -17,6 +17,7 @@ functionality.
 - [Framework](#framework)
   - [Current status](#current-status)
   - [Building](#building)
+  - [Plugin formats](#plugin-formats)
   - [Example plugins](#example-plugins)
 - [Licensing](#licensing)
 
@@ -52,6 +53,14 @@ of the plugin:
 cargo xtask bundle gain --release
 ```
 
+### Plugin formats
+
+NIH-plug can currently export VST3 plugins, with CLAP support being worked on
+right now. Exporting a specific plugin format for a plugin is as simple as
+calling the `nih_export_<format>!(Foo);` macro. The `cargo xtask bundle` commane
+will detect which plugin formats your plugin supports and create the appropriate
+bundles accordingly, even when cross compiling.
+
 ### Example plugins
 
 The best way to get an idea for what the API looks like is to look at the