Add some about information

readme.rst

@@ -1,3 +1,39 @@
+About
+=====
+
+This extension should only demonstrate technical features of TYPO3.
+It is not intended for use in production systems.
+
+The following features should be demonstrated:
+
+PSR-4 Autoloading Standard
+   Use `composer.json` to provide autoloading information.
+   Classes will be loaded when needed. No need for require statements.
+
+PSR-12 Extended Coding Style Guide
+   Current stable Coding Style Guide, applied via Coding Sniffer.
+
+PSR-7 HTTP Message Interface
+   Also known as Request Response, used to create tracking information from incoming
+   request.
+
+PSR-11 Container Interface
+   Also known as Dependency Injection.
+   Used to resolve external dependencies, e.g. foreign classes.
+   Existing TYPO3 factories are used to build `QueryBuilder` instances.
+   Also DI is "misused" to provide configuration for dashboard widgets
+   and tracking blacklists.
+
+PSR-15 HTTP Handlers
+   Also known as middlewares.
+   Used to hook into processing to create tracking information.
+
+PSR-14 Event Dispatcher
+   Not in use yet.
+
+EXT:dashboard
+   Used to visualize collected tracking information.
+
 Todos
 =====