Add README.md to github.com/sugarlabs
We are currently lacking a template README.md file that can be used to describe what is in each repository in the SL github account. This README file, written in Markdown, should (1) give a brief introduction to the content in the repository, e.g., explain what types of things are found here, the toolkit, sugar, activities, documentation, the web site; and (2) describe in brief the process by which contributions can be made -- via Pull Requests. Links to more detailed descriptions should be included. Additional content specific to the repository can also be included. Please submit the README.md as a pull request to the sugar-docs repository.
Also, please attach to this task a list of repos in the SL github account that are missing README.md files.