Update README

Author: VeckoTheGecko

README.md

@@ -7,3 +7,21 @@ This repository contains datasets for use in [Parcels](https://github.com/OceanP
 ## Available datasets
 
 See [parcels/tools/exampledata_utils.py](https://github.com/OceanParcels/parcels/blob/main/parcels/tools/exampledata_utils.py) for a list of available datasets.
+
+
+## Adding a new dataset
+
+1. Choose a (filename safe) name for your dataset. This will be used as a key to refer to the dataset in the Parcels, and will also be the name of the folder.
+2. Assuming you have your folder with your data files. E.g., 
+
+```
+MovingEddies_data
+├── moving_eddiesP.nc
+├── moving_eddiesU.nc
+└── moving_eddiesV.nc
+```
+just move this to the `data` directory.
+
+3. Update [parcels/tools/exampledata_utils.py](https://github.com/OceanParcels/parcels/blob/main/parcels/tools/exampledata_utils.py) accordingly to include your new dataset.
+
+All NetCDF files are tracked by Git LFS. If you want to expand the files included in Git LFS, see the [GitHub docs](https://docs.github.com/en/repositories/working-with-files/managing-large-files/configuring-git-large-file-storage).