docs(validation): Add a documentation on Vaadin Connect validation functionality

vaadin / vaadin-connect

A Vaadin Labs experiment with a secure stateless communication framework

https://vaadin.com/labs/vaadin-connect

Apache License 2.0

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Closed SomeoneToIgnore closed 5 years ago

SomeoneToIgnore commented 5 years ago

Closes #282 Closes #281

I decided to unite both tickets in the same PR since there's not much to document on the topic hence no need to split it.

This change is