Update README.md

Add dataset download from GCS

README.md

@@ -46,6 +46,7 @@ We can install it directly through pip
 
 ```bash
 pip install git+https://github.com/spaceml-org/helio_tools
+pip install gsutil
 ```
 
 We also use poetry for the development environment.
@@ -58,6 +59,12 @@ conda activate helio_tools
 poetry install
 ```
 
+---
+## Test Dataset
+We provide a test dataset for the notebooks containing data from SDO/AIA, EUI/FSI, EUI/HRI and PROBA2/SWAP which can be downloaded with gsutil 
+```bash
+gsutil cp -r gs://iti-dataset/ [local_path]
+
 ---
 ## References
 
@@ -73,4 +80,4 @@ poetry install
 * [EVE](https://lasp.colorado.edu/home/eve/data/) - Extreme Ultraviolet Variability Experiment.
 * [SolO](https://sci.esa.int/web/solar-orbiter) - Solar Orbiter.
 * FSI - Full Sun Imager.
-* [SOHO](https://soho.nascom.nasa.gov//) - Solar and Heliospheric Observatory.
+* [SOHO](https://soho.nascom.nasa.gov//) - Solar and Heliospheric Observatory.