docs: add diagrams for facade, factory kit, factory method, factory, fan-out/fan-in, feature toggle, filterer, fluent interface, flyweight, front controller, function composition

feature-toggle/README.md

@@ -34,6 +34,10 @@ Wikipedia says
 
 > A feature toggle in software development provides an alternative to maintaining multiple feature branches in source code. A condition within the code enables or disables a feature during runtime. In agile settings the toggle is used in production, to switch on the feature on demand, for some or all the users.
 
+Flowchart
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+![Feature Toggle flowchart](./etc/feature-toggle-flowchart.png)
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 ## Programmatic Example of Feature Toggle Pattern in Java
 
 This Java code example demonstrates how to display a feature when it is enabled by the developer and the user is a Premium member of the application. This approach is useful for managing subscription-locked features.