Add AutoSave Example - React

[miteshgoplani]

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

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

1. Retrieve the sessionEvents from the resources props
this.sessionEvents = this.props.resources.sessionEvents;

2. Subscribe to autosaveEmitter

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

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 unmounts
2. You must add an autosave property to pluginDefinition "autosave": true

Signed-off-by: miteshgoplani miteshgoplani@gmail.com