Tutorial 2: Functions and types - init (#2)

* Init from MarekSuchanek/FPCourse

* (Tail) recursion explained briefly

* Homework info added

* Text of patterns, list funcs, string

* List funcs and patterns examples

* Deriving typeclass intro

* Play with deriving typeclass

* Grammar fix with Grammarly

* Fixs after Robert's review

Author: MarekSuchanek