Add descriptions of test-specific assumptions

[Karatsidis]

Overview

Currently, little information is provided on the basic assumptions for each algorithm in DISPEL.
For instance, gait and turn algorithms assume a lumbar-mounted device. Drawing algorithms assume a handheld device.

Objectives

1. Add information about BDH/ADS Konectom battery of tests based this link
2. Add information about APDM / Mobilise-D data based on this link
3. Add information about Digital Artefacts Finger Tapping this link

Desired Outcomes

• More information about test-specific assumptions and instructions added as module doctstrings.