Add doc to create new automatic actions

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+Adding Automatic Actions
+========================
+
+Adding a new automatic action is pretty simple.
+
+Creating a new action
+---------------------
+
+Your automatic action must inherit of the class `Kanboard\Action\Base`.
+Several abstract methods must be implemented by yourself:
+
+| Method                              | Description                                                      |
+|-------------------------------------|------------------------------------------------------------------|
+| `getDescription()`                  | Description visible in the user interface                        |
+| `getCompatibleEvents()`             | Get the list of compatible events                                |
+| `getActionRequiredParameters()`     | Get the required parameter for the action (defined by the user)  |
+| `getEventRequiredParameters()`      | Get the required parameter for the event                         |
+| `doAction(array $data)`             | Execute the action, must return true on success                  |
+| `hasRequiredCondition(array $data)` | Check if the event data meet the action condition                |
+
+Your automatic action is identified in Kanboard by using the absolute class name with the name space included.
+
+Adding new events
+-----------------
+
+The list of application events is available in the class `Kanboard\Core\Event\EventManager::getAll()`.
+However, if your plugin fires new events, you can register these events like that:
+
+```php
+$this->actionManager->getAction('\Kanboard\Plugin\MyPlugin\MyActionName')->addEvent('my.event', 'My event description');
+```
+
+You can extend the list of compatible events of existing actions by using the same method.
+
+Registering the action
+----------------------
+
+You have to call the method `register()` from the class `Kanboard\Core\Action\ActionManager`:
+
+```php
+<?php
+
+namespace Kanboard\Plugin\AutomaticAction;
+
+use Kanboard\Core\Plugin\Base;
+use Kanboard\Plugin\AutomaticAction\Action\TaskRename;
+
+class Plugin extends Base
+{
+    public function initialize()
+    {
+        $this->actionManager->register(new TaskRename($this->container));
+    }
+}
+```
+
+Example
+-------
+
+- [Automatic Action example](https://github.com/kanboard/plugin-example-automatic-action)