Edit README.md

README.md

@@ -31,6 +31,20 @@ cd noche
 pip install -e .
 ```
 
+## Quick test
+
+```python
+
+my_obs = "oarpaf" # Currently supported ['grt', 'opc', 'oarpaf', 'ogg', 'ossfoligno', 'abobservatory']
+
+from noche import Noche
+n = Noche()
+n.load_noctis_observatory(my_obs, "original.fits") 
+n.write_noctis_fits("file_with_new_header.fits")
+
+```
+
+
 ## Usage Example
 ```python
 from noche import Noche