Control Node Documentation

[saiaravind19]

Hey I am trying to get myself familiarised with the behaviour trees and trying to implement all the tutorials.I have few suggestions hope its useful.

• Control nodes documentation is missing (switch,ifThenElse,WhileDoElse ).
• It took some time to understand how to actually implement the basic sequence control block.
• I am still not sure why to use tickWhileRunning.
  In total amazing work and but trying to learn is not a smooth ride .
  Is the documentation opensouce so that we can also help in updating the documentation and implement more examples for better of overall picture.

[facontidavide]

It is open source!
https://github.com/BehaviorTree/btcpp_website