Add plugins/README

.gitignore

@@ -15,7 +15,7 @@
 /builder/dub.json
 /builder/views
 /crash
-/plugins
+/plugins/*/
 /resources
 /worlds
 /*.toml

plugins/README.md

@@ -0,0 +1,13 @@
+Plugins are a way to extend the functionality of Selery.
+They are written in D (like Selery) and are compiled with the server.
+
+## Structure
+
+Plugins placed in the `plugins` folders are automatically compiled with Selery to create an executable file.
+
+Every plugin must contain a `plugin.toml` file that indicates how and when compile the plugin.
+The field are the following:
+- `name`: Indicates the plugin's name. It must be unique on the server.
+- `authors`: An array with the authors of the plugin.
+- `target`: Whether the plugin is executed on the `hub` or on the `node`. Read the main README file for more informations about Selery's model.
+- `main`: The main class of the plugin that must extend `HubPlugin` or `NodePlugin`.