Adding ReefSet dataset

[BenUCL]

Adding ReefSet as per instructions in ReadMe

[Cangonin]

Thank you for contributing! 🔥 I have two small requests:

1. The creators fields is supposed to be an array of strings, not a string. The reason is to have a consistent display of the datasets creators in the webapp for all datasets. Could you replace the value of this field by the following snippet?

 "creators": [
    "Ben Williams",
    "Bart van Merriënboer",
    "Vincent Dumoulin",
    "Jenny Hamer",
    "Abram B. Fleishman",
    "Matthew McKown",
    "Jill E. Munger",
    "Aaron N. Rice",
    "Ashlee Lillis",
    "Clemency E. White",
    "Catherine A. D. Hobbs",
    "Tries B. Razak",
    "Kate E. Jones",
    "Tom Denton"
  ],

2. Is there a reason why you specified an additional description but no description? If not, what about leaving the additional description field empty and filling the description field instead?

[BenUCL]

Thanks, I've made the changes!