Update README.md

Added contribution section and some to-do's.
Update README.md

Updated formatting.
Merge pull request #8 from Injac/development

Development
Added Changelog
Apply StyleCop, generate documentation.
Merge pull request #11 from saramgsilva/master

Apply StyleCop, generate documentation.
Add metadata for nuget, cmd for generate nuget, license.
Add reference for helpers
Merge pull request #13 from saramgsilva/patch-1

Add reference for helpers
Merge pull request #12 from saramgsilva/master

Add metadata for nuget, cmd for generate nuget, license.
Changed nuspec file to point to the right project URL and changed the Nuget icon.