Add contribution instructions.

Merge branch 'master' of git.nzoss.org.nz:alcinnz/stylish-haskell

Describe how I'm treating the two major version numbers.

Update README.md

Update README.md

Update README.md

[Project] Stylish Haskell

Generic implementation of CSS selectors, specificity, cascade, and inheritance
independant of supported CSS properties.

Add and pass some unit tests.

Init module.

Initial commit