Doc change
Exercises 6 and 7
Typo in doc
Clarification around some of the questions
Clarification on first question, using linear conversions in an area conversion question
More doc clarification
Add solutions to chapter two questions
Update README into Markdown and with links to Noels repo
Add solutions for chapter three. firstColour, reverseColourOrder and paintMix
Solve chapter four problems
Solve chapter five problems