Contribution - feedback

[Adafede]

Feedback from @egonw about the https://search.nprod.net/contribute:

1. you will want to give feedback at some point before 'Add' on missing stereochemistry. even if not known, they should be able to check where the stereo is missing, perhaps?
2. give some visual feedback on the DOI, that they picked the right paper... e.g. use citation.js
3. eventually ask people to add physchem properties, but not sure how common that is in NP literature
4. add a clear statement you will add the information to Wikidata (?)
5. add visual indicator to make the steps more obvious (and maybe like "Step 1/4")