Update docs

spring-shell-docs/modules/ROOT/pages/appendices/tui/catalog.adoc

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+[#appendix-tui-catalog]
+= Catalog App
+:page-section-summary-toc: 1
+
+ifndef::snippets[:snippets: ../../../../../src/test/java/org/springframework/shell/docs]
+
+Catalog application is showing various ways how Terminal UI Framework can be used.
+In this section we discuss how this application works. It can be considered to be
+a reference application as it's using most of the features available and tries
+to follow best practices.
+
+[[create-scenario]]
+== Create Scenario
+Every `Scenario` essentially is a sample code of a `View` as that's what catalog
+app demonstrates. In the sample app create a new scenario class under
+_scenario_ package and implement it as something shown below.
+
+[source, java, indent=0]
+----
+include::{snippets}/CatalogSnippets.java[tag=samplescenario]
+----
+
+NOTE: You need to define all fields, `name`, `description` and `category`
+with _@ScenarioComponent_.

spring-shell-docs/modules/ROOT/pages/appendices/tui/index.adoc

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+[appendix]
+[#appendix-tech-intro-tui]
+= Terminal UI
+:page-section-summary-toc: 1
+
+ifndef::snippets[:snippets: ../../test/java/org/springframework/shell/docs]
+
+This is a technical introduction to _UI Framework_.
+
+_UI Framework_ is a toolkit to build rich console apps.
+
+
+
+
+
+
+

spring-shell-docs/modules/ROOT/pages/appendices/tui/viewdev.adoc

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+[#appendix-tui-eventloop]
+= View Development
+:page-section-summary-toc: 1
+
+While a _view_ just need to implement `View` it's usually convenient to just
+use `BoxView` as a parent.
+
+== Register Bindings
+
+In an `AbstractView` use variants of _registerKeyBinding_, _registerHotKeyBinding_
+and _registerMouseBinding_.