add details on datalad datasets

copied and adapted from https://handbook.datalad.org/en/latest/basics/101-180-FAQ.html#dataset-textblock

README.md

@@ -1,9 +1,68 @@
 # Replay Illustrations
 
+[![made-with-datalad](https://www.datalad.org/badges/made_with.svg)](https://datalad.org)
+
 ## About
 
 This repository contains illustrations that I regularly use in talks about [my work](https://scholar.google.de/citations?user=GXvJB1kAAAAJ&hl=de&oi=ao) on investigating fast sequential memory reactivation (replay) in humans using fMRI.
 
+## DataLad datasets and how to use them
+
+This repository is a [DataLad](https://www.datalad.org/) dataset.
+It provides fine-grained data access down to the level of individual files, and allows for tracking future updates.
+In order to use this repository for data retrieval, [DataLad](https://www.datalad.org/) is required.
+It is a free and open source command line tool, available for all major operating systems, and builds up on Git and [git-annex](https://git-annex.branchable.com/) to allow sharing, synchronizing, and version controlling collections of large files.
+You can find information on how to install DataLad at [handbook.datalad.org/en/latest/intro/installation.html](http://handbook.datalad.org/en/latest/intro/installation.html).
+
+### Get the dataset
+
+This DataLad dataset can be `cloned` by running
+
+```bash
+datalad clone https://github.com/lnnrtwttkhn/replay-illustrations
+```
+
+Once the dataset is cloned, it is a light-weight directory on your local machine.
+At this point, it contains only small metadata and information on the identity of the files in the dataset, but not actual *content* of the (sometimes large) data files.
+
+### Retrieve dataset content
+
+After cloning a dataset, you can retrieve file contents by running
+
+```bash
+datalad get <path/to/directory/or/file>`
+```
+
+This command will trigger a download of the files, directories, or subdatasets you have specified.
+
+For example, you can retrieve all illustrations in `.pdf`-format by running
+
+```bash
+datalad get illustrations/*/*.pdf
+```
+
+### Stay up-to-date
+
+DataLad datasets can be updated.
+The command `datalad update` will *fetch* updates and store them on a different branch (by default `remotes/origin/master`).
+Running
+
+```bash
+datalad update --merge
+```
+
+will *pull* available updates and integrate them in one go.
+
+### Find out what has been done
+
+DataLad datasets contain their history in the ``git log``.
+By running ``git log`` (or a tool that displays Git history) in the dataset or on specific files, you can find out what has been done to the dataset or to individual files by whom, and when.
+
+### More information
+
+More information on DataLad and how to use it can be found in the DataLad Handbook at [handbook.datalad.org](http://handbook.datalad.org/en/latest/index.html).
+The chapter "DataLad datasets" can help you to familiarize yourself with the concept of a dataset.
+
 ## Requirements
 
 ### Affinity Designer