Update main readme with more informative template

[georgerichardson]

The current readme project root directory readme specifies minimal installation instructions and some other information. The lack of guidelines or a template lowers expectations and creates an overhead to creating good readmes. This is leaving us with projects that have incomplete or uninformative readmes. This will add:

• Project name
• Description of project
• A nice picture or graphic
• Outline of the components of the project
• Guide for where to find parts of the pipeline and analysis
• Link to other resource (e.g. slide deck of results)
• Installation instructions
• Who to reach out to with questions