Add section 'Overview'
Remove carriage returns

GitHub breaks lines on carriage returns
which decreased the readability of the
README. This commit removes all
unnecessary <CR>s.
Add section 'Installation'
Add section 'Roadmap'
Add missing full-stop
Improved README

Added sections:
  - Overview
  - Installation
  - Usage
  - Roadmap
Merge branch 'fix/3' of github.com:Blyton/blyton into fix/3
Merge pull request #4 from Blyton/fix/3

Improve README