BallotMaker documentation

[stratofax]

Based on the excellent documentation for the TrustTheVote-Project/MarkIt-Client-Mobile-App repo, it's time to up our documentation game here at the BallotLab. Some ideas:

Solid documentation for everything related to ballots. Examples of things we think the client might want written down in some fashion:

• explanation of field types / IDs
• expectation of the client when marking a contest selection (checkbox)
• expectation of the client when marking a write-in
• etc.

Include in the project's READ.ME file a link to Cliff's EDF documentation about which subset of the EDF schema is implemented in this project

[awoflaherty]

In your documentation, please link to this:
https://github.com/TrustTheVote-Project/MarkIt-Client-Mobile-App/blob/main/libs/services/pdf/README.md#affidavit-pdfs
and advise Matt or me if anything in the link is not accurate.

[stratofax]

@awoflaherty I don't know much about affidavit PDFs. Better to link here, perhaps? https://github.com/TrustTheVote-Project/MarkIt-Client-Mobile-App/blob/main/libs/services/pdf/README.md#ballot-pdfs