Create contributor file that includes some guidelines for developers
Rewrite some phrases and improving format of the document
Add Troubleshooting section and fixing spelling errors
Addding summary and organizing the sections
Fix typos and broken link
Fix problems with some ambiguous parenthesis
Merge pull request #85 from thoughtworks/guidelines

Merging.  I see a few typos that can be fixed, but it's easy to evolve this do once it's live.