Add a section about short-cuts to the reference

[LukasCBossert]

Working with the shell I find it very handy to use certain short-cuts when navigating through the shell-history or the commands I am using.

I found a nice overview provided by the German LC-workshop on Bits and Pieces for the carpentry workshops.

For example:

short-cut	result
ctrl+r	navigate through your history of used commands