update READMEs

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Jakub Vojvoda
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## Fa<46>ade
Provide a unified interface to a set of interfaces in a subsystem. Facade
defines a higher-level interface that makes the subsystem easier to use.
### When to use
* you want to provide a simple interface to a complex subsystem
* there are many dependencies between clients and the implementation classes of an abstraction
* you want to layer your subsystems, use a facade to define an entry point to each subsystem level