add Forward.md

docs/002.Forward.md

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+Forward
+=======
+
+The plugin allows to dispatch additional controllers:
+```
+use Es\ControllerPlugins\PluginsTrait;
+
+class ExampleController
+{
+    use PluginsTrait;
+
+    public function fooAction()
+    {
+        $result = $this->forward('Foo.Bar.Baz', 'index', ['foo' => 'bar']);
+        // ...
+    }
+}
+```
+Arguments:
+
+- The first argument should specify the name of controller exactly as the 
+  controller has been registered in the `Controllers` service.
+- The second argument should specify the name of action withot `Action` postfix;
+  `null` as argument means `index` action.
+- Optionally you can specify the third argument as array of parameters, that 
+  will be added to event of dispatch.