Propose new features based on knee geometry

[ninanikitina]

As a software engineer who is not an expert in the biomedical engineering area, I want to have a description of features recommended by experts in the field so that I can extract these features from the data

Definition of Done

• [ ] List of four new features with descriptions is created
• [ ] List of these features is approved by Kalin

Tasks

• [x] #110
• [x] #111
• [ ] #112
• [x] #113