Add plugin library.

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diff --git a/plugin/README.md b/plugin/README.md
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+# Plugin
+
+A library for loading plugins and watching plugin updates.
+
+The plugin engine allows the client to load plugins and call their functions.
+
+Plugins can also be associated with a state. The engine does not create the
+plugin's state because this may require other application-specific state.
+
+Plugin files are watched for updates. Upon an update, the engine reloads the
+plugin into memory and notifies the client. The client should then typically
+re-create the plugin's state.