Add AutoSave Example - Angular

[miteshgoplani]

This PR serves as an example of how to subscribe to an AutoSave Event by Zowe Desktop for an Angular Application

This example demonstrates how to save the parameters and AppId of Angular App:

1. Inject the Session Events token
@Inject(Angular2InjectionTokens.SESSION_EVENTS) private sessionEvents: Angular2PluginSessionEvents

2. Subscribe to autosaveEmitter

   this.autoSaveEvent = this.sessionEvents.autosaveEmitter.subscribe((saveThis: any)=> {
      if (saveThis) {
        saveThis({'appData':{'requestText':this.parameters,'targetAppId':this.targetAppId}});
      }
    });

3. Receive saved data
In order to receive the data, use data.appData.requestText and data.appData.targetAppId as seen in handleLaunchOrMessageObject()

Note:

1. It is necessary to unsubscribe to the AutoSave Event when the component is destroyed
2. You must add an autosave property to pluginDefinition "autosave": true

Signed-off-by: miteshgoplani [email protected]