conf(che): add task to start vnc

.vscode/tasks.json

+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+      {
+        "label": "Run vnc",
+        "type": "shell",
+        "command": "./che/startui.sh",
+        "group": "none",
+        "presentation": {
+          "reveal": "always",
+          "panel": "new"
+        }
+      }
+    ]
+  }
+  
\ No newline at end of file