Create unified ADRG standard for R submissions

[nanxstats]

I propose we work together to create a common, unified ADRG content standard and templates for R submissions. This could help simplify work for everyone:

• Sponsors would have guidance on how R-specific sections in ADRG should be constructed and what to include. Searching "ADRG" on the submission WG website shows 17 results from past meetings - there are surely some confusions out there.
• Reviewers would have clear expectations for the R submission ADRG generated across sponsors, and with a level of consistency, they can standardize their review workflow and save time.

cc @lengning @joseph-rickert

[SHAESEN2]

Please include me in the future working group.