Adding results for sprint 2

[hannahbrucemacdonald]

This PR adds the files used to make purchasing decisions for the second covid-moonshot sprint.

Details are outlined in the README.md. The 24 molecules proposed for purchasing are in purchasing.csv, however contain three uncertain esters, which may be removed.

[jchodera]

This is great! Can you just add a ### Manifest section where you describe what the checked in files are to the README.md?

[PantherX]

Hiya @hannahbrucemacdonald
I spotted this in the purchasing CSV file where row 8 has an extra column due to , similar to EN300-382173 and not sure where it will be imported into but an option would be to add a column "Notes" and while it can be blank for all rows (simply have , at the end of all those rows), it will be populated for row 8 😃

[hannahbrucemacdonald]

Ah good spot @PantherX ! I should be more careful where I scribble stuff! Adopting the format you suggest now!