added some discussion notes
Added functions file
Added the quiz questions
notes on function components
finished base functions exercise
finished function component exercises
lexical scoping notes
lexical scoping exercises
added more notes and exercises
Added more exercises; replacement function not working yet
Added comment about not working function.
Added final reading notes.
Added final exercises.
merge
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Created Environments notes
Added quiz and some environment basics notes.
finished part 1 exercises
part 2 exercises