add_from_demographics: Add Demographics Information to Info Table
In tsostarics/anrlab: What the Package Does (One Line, Title Case)

This is a wrapper for left_join to make it a bit easier for people without knowledge of SQL-esque joins to simply take information from the demographics table (such as subject ID or aphasia status) and add it to the info table.

add_from_demographics(
  extracted_info,
  demographics,
  include_cols,
  record_id_col = "record_id"
)

`extracted_info`	Output of extract_info
`demographics`	Demographics table from split_instruments
`include_cols`	Which columns to add to the info table
`record_id_col`	Defaults to record_id