Add app manager plugin

README.md

@@ -124,6 +124,51 @@ message: "app [app_manager/appA] started"
 namespace: "/robot/application"
 ```
 
+## Plugins
+
+You can define `app_manager` plugins as below in app file such as `test.app`.
+
+```yaml
+plugins: # plugin definitions
+  - name: mail_notifier_plugin  # name to identify this plugin
+    type: app_notifier/mail_notifier_plugin  # plugin type
+    launch_args:  # arguments for plugin launch file
+      - foo: hello
+    launch_arg_yaml: /etc/mail_notifier_launch_arg.yaml  # argument yaml file for plugin launch file
+    # in this case, these arguments will be passed.
+    # {"hoge": 100, "fuga": 30, "bar": 10} will be passed to start plugin
+    # {"hoge": 50, "fuga": 30} will be passed to stop plugin
+    plugin_args:  # arguments for plugin function
+      - hoge: 10
+      - fuga: 30
+    start_plugin_args:  # arguments for start plugin function
+      - hoge: 100  # arguments for start plugin function arguments (it overwrites plugin_args hoge: 10 -> 100)
+      - bar: 10
+    stop_plugin_args:  # arguments for stop plugin function
+      - hoge: 50  # arguments for stop plugin function arguments (it overwrites plugin_args hoge: 10 -> 50)
+    plugin_arg_yaml: /etc/mail_notifier_plugin_arg.yaml  # argument yaml file for plugin function arguments
+  - name: rosbag_recorder_plugin  # another plugin
+    type app_recorder/rosbag_recorder_plugin
+    launch_args:
+      rosbag_path: /tmp
+      rosbag_title: test.bag
+      compress: true
+      rosbag_topic_names:
+        - /rosout
+        - /tf
+        - /tf_static
+plugin_order: # plugin running orders. if you don't set field, plugin will be run in order in plugins field
+  start_plugin_order:  # start plugin running order
+    - rosbag_recorder_plugin  # 1st plugin name
+    - mail_notifier_plugin  #2nd plugin name
+  stop_plugin_order:  # start plugin running order
+    - rosbag_recorder_plugin
+    - mail_notifier_plugin
+```
+
+Sample plugin repository is [knorth55/app_manager_utils](https://github.com/knorth55/app_manager_utils).
+
+For more detailed information, please read [#25](https://github.com/PR2/app_manager/pull/25).
 
 ## Maintainer