Move documentation to GitHub

[helmbold]

Since CodePlex is shutting down, I suggest to move all documenation hosted at CodePlex to GitHub.

CodePlex will be finally shut down on 2017-12-17.

[atifaziz]

Done:

• Build Instructions
• Documentation
• FAQ
• Handling Simple Data
• Hello World
• Home
• Installing R Packages
• Notes on CRAN
• Quick Start
• Release Checklist
• Roadmap
• Spatial Temporal Model
• Technical Notes
• Technical Reference
• Troubleshooting

Hope this helped.

[helmbold]

Thanks!