Add "What are alchemical free energy methods" section

[fjclark]

Proposed Change

Add "What are alchemical free energy methods" section briefly summarising the same section in the first paper, directing readers
to the first paper, and highlighting their use a high-throughput, multiple calculation setting.

Proposed Authors and Reviewers

Please volunteer (before the end of January) to author/ review and state when you're available. Authors, please say roughly when you plan to contribute the changes (no later than the end of May).

Proposed author: Volunteer wanted
Proposed reviewer: Volunteer wanted

[elvismartis]

@fjclark I can write this section.
Best
Elvis