Update README
Unstashing changes!

* Implementation of different tree of terminals.
* Add and remove terminals

TODO:
* Re-work focus shortcuts
* Clean memory
* Clean code
* ...
Screenshot.
Improved tabs behavior

* Getting top level views from containers
* Event listener to assign focus to leaves of tabs
Merge github.com:vincepii/konsole-multi-terminal

Conflicts:
	src/MultiTerminalDisplayManager.cpp
	src/MultiTerminalDisplayManager.h
	src/ViewManager.cpp