Update metainfo.json

metainfo.json

 {
   "authors": [
-    "John, Doe",
-    "Bob, Alice"
+     "Xiangyue, Liu", 
+     "Fawzi Mohamed", 
+     "Luca M. Ghiringhelli"
   ],
-  "email": "user@domain.com",
-  "title": "Title of the tutorial",
-  "description": "In this tutorial we will ...",
+  "email": "xyliu@fhi-berlin.mpg.de",
+  "title": " Visualization of the band structure of materials",
+  "description": "This tutorial helps visualizing the electronic band structure of materials that ar ein the NOMAD Archive",
   "url": "https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-tutorial-template",
   "link": "https://analytics-toolkit.nomad-coe.eu/hub/user-redirect/notebooks/tutorials/Welcome.ipynb",
   "created": "",
@@ -21,7 +22,7 @@
       "keyword2"
     ],
     "application_section": [
-      "Materials property prediction"
+      "Exploratory, visualization tools"
     ],
     "application_system": [
       "System"
@@ -30,7 +31,7 @@
       "Tutorial"
     ],
     "data_analytics_method": [
-      "Clustering"
+      "None"
     ],
     "platform": [
       "jupyter"