Complete readme

[PROgram52bc]

Finish documenting the following features:

• how to Add a metric
• how to transform images (image command)
• how to analyze images using existing metrics (data command)
• tools to help with human data collection (sequence and printable command)
• info command (to be added after more functionality in Update the consts file #2 is completed)
• An overall statement of the purpose of this project (mention defining transformations and test metric's sensitivity to the transformations)