added Essen demo to content.json

public/content/content.json

@@ -22,6 +22,30 @@
       "project":"http://icity.hft-stuttgart.de/#/"
     }
   }, 
+  {
+    "item": {
+      "title": "Extraction of window contours from point clouds",
+      "project": "Simstadt 2.0",
+      "author": {
+        "firstName": "Sven",
+        "lastName": "Schneider",
+        "hftURL": "https://www.hft-stuttgart.de/p/sven-schneider"
+      },
+      "project_year_start": "2017",
+      "project_year_end": "2021",
+      "project_is_on_going": false,
+      "imageLink":"https://www.hft-stuttgart.de/fileadmin/Dateien/Forschung/_processed_/7/9/csm_SimStadt-Logo-center_a45bca58ae.png",
+      "keywords":["CityGML", "Urban Simulation","SimStadt"],
+      "description_en":"As part of Simstadt 2.0, a method was developed to automatically extract window contours from building facedes from high-resolution point clouds to improve simulation accuracy.",
+      "description_de":"Im Rahmen von Simstadt 2.0 wurde eine Methode entwickelt, um Fensterkonturen automatisiert in hochauflösenden Punktwolken zu detektieren und zu extrahieren, um die Simulationsgenauigkeit zu erhöhen."
+    },
+    "refIndex": 5,
+    "links": {
+      "demo": "https://urbanvis.hft-stuttgart.de/EssenPC.html?",      
+      "publication": "https://www.dgpf.de/src/tagung/jt2018/proceedings/proceedings/papers/44_PFGK18_P03_Schneider_Coors.pdf",
+      "project":"https://www.hft-stuttgart.de/forschung/projekte/abgeschlossen/simstadt-20"
+    }
+  },
   {
     "item": {
       "title": "INSPIRER case-studies",