Add Git information to README
completed by: Max Vorobuov
Task Description: The README file in the Parrot repository provides information to give the user a quick start to building and using Parrot. An important part of that process, fetching the latest parrot source or the parrot source from a previous tag, is missing from README. To fix this, the student should:
- Clone a copy of the Parrot repository on github
- Update README to include information about the Parrot repository on github, how to fetch source from master, how to fetch source from a tag, and how to install Git.
- Open a pull request at http://github.com/parrot/parrot
Benefits: The README file is one of the first files that people with the Parrot source code will see, and it appears on the front page of our repository at github. By having a comprehensive and accurate README we can help new users to get started faster and with fewer hassles.