[commerce_pado] Commerce Product Add-on

# Summary

Commerce Product Add-On allows users to attach products as options to the add to cart form of another product. This is particularly useful for things like event sponsorship, optional accessories, and other up-sells.

# Project URL

https://www.drupal.org/project/commerce_pado

# Where is the code?

Drupal.org

# Estimated completion date

(If known, when is this module targeted for completion?)

# Dependencies

(What other modules does this one depend on? Ideally, link to the dependent project issue if it already exists.)

# Who's doing the port?

mglaman, czigor

# What help do they need?

(Are there specific types of resources (e.g. skillsets, $, sprints) that would be helpful to expedite porting?)

# D8 roadmap

(A link to a meta issue, handbook page, Google Doc, etc. with the plan on how to port to D8.)

# Background and reference information

(Links to any other helpful information, documentation, etc.)