Add contribution instructions.

Update newly-tested build instructions.

Merge remote-tracking branch 'contrib-ariana/doc-update'

Update & Fix grammar throughout docs files

Applies many small changes throughout the documentation files, aimed at
readability.

Clarify installation instructions based on testing/feedback.

Update README, seperate out CONTRIBUTING.md

Merge branch 'master' of git.nzoss.org.nz:alcinnz/rhapsode

Provide installation instructions.

Update README.md

Update README.md

Update README.md

Initial commit