Update README with better instructions.

Added installation/setup instructions and cleaned up the intro section a bit as well as added a heading.
Fix formatting/example code issues.

* Fix `sc_config` issues in the code.
* Add some headings to separate the sections.
* Fix GitHub links to use `git://` instead of the SSH version.
* Add notes on the different ways to get started (clone the example, use existing, create new).
Add missing git checkout command
Merge pull request #10 from topherfangio/patch-1

Update README with better instructions.