_Subapp descriptor by node

Here is an example of a main subapp inside a helloworld app. Create subapp configuration under the subApps folder.

Node name	Value
modules
ui-helloworld-app
apps
helloworld
subApps
main
class	info.magnolia.ui.api.app.registry.ConfiguredSubAppDescriptor
label	Hello!
subAppClass	info.magnolia.ui.app.helloworld.main.HelloWorldMainSubApp

Properties:

`<subapp name>`	required Subapp node name. This is the internal ID of the subapp. Used to reference the subapp for example in URL fragments.
`class`	required, default is `info.magnolia.ui.api.app.registry.ConfiguredSubAppDescriptor` Subapp descriptor class that reads the configuration. The class must implement the $webResourceManager.requireResource("info.magnolia.sys.confluence.artifact-info-plugin:javadoc-resource-macro-resources") SubAppDescriptor interface. Examples of such classes are $webResourceManager.requireResource("info.magnolia.sys.confluence.artifact-info-plugin:javadoc-resource-macro-resources") ConfiguredSubAppDescriptor and $webResourceManager.requireResource("info.magnolia.sys.confluence.artifact-info-plugin:javadoc-resource-macro-resources") ConfiguredContentSubAppDescriptor . Use the fully-qualified name of the class.
`closable`	optional, default is `true` Whether the subapp can be closed. When set to `false` no close icon (X) is displayed.
`icon`	optional CSS class that identifies an icon font used on the app tab. For available names see Icons.
`label`	optional Text or message bundle key. Displayed in the subapp tab.
`subAppClass`	required Subapp business logic class. The class must implement the $webResourceManager.requireResource("info.magnolia.sys.confluence.artifact-info-plugin:javadoc-resource-macro-resources") SubApp interface which displays the subapp to the user in a tab.

The order in which you configure subapps is important. The first subapp will be the default subapp. It is started first.

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