Samples Catalog=======A collection of sample apps that demonstrate how Flutter can be used.Each sample app is contained in a single `.dart` file and they're all found inthe lib directory.The apps are intended to be short and easily understood. Classes that representthe sample's focus are at the top of the file, data and support classes follow.Each sample app contains a comment (usually at the end) which provides somestandard documentation that also appears in the web view of the catalog.See the "Generating..." section below.Generating the web view of the catalog---------Markdown and a screenshot of each app are produced by `bin/sample_page.dart`and saved in the `.generated` directory. The markdown file containsthe text taken from the Sample Catalog comment found in the app's sourcefile, followed by the source code itself.This sample_page.dart command line app must be run from the examples/catalogdirectory. It relies on templates also found in the bin directory and itgenerates and executes `test_driver` apps to collect the screenshots:```cd examples/catalogdart bin/sample_page.dart```