Add short description to metadata dictionary

Author: migueldvb

tutorials/UVES/UVES.ipynb

@@ -5,7 +5,8 @@
    "date": "May 2014",
    "link_name": "Analyzing UVES Spectroscopy with Astropy",
    "name": "",
-   "published": true
+   "published": true,
+   "description" : "This tutorial demonstrates the data analysis of MN Lup obtained with the UVES spectrograph on the VLT."
   },
   "signature": "sha256:1f74796dfdd5b13d06d2a9bd9913a15fe6aa475e7967f8bd969ddcf17fb1e825"
  },