Add env variables to preprod (#75)

Author: carlsixsmith-moj

src/Visualiser/appsettings.PreProduction.json

@@ -0,0 +1,8 @@
+{
+  "API": {
+    "Scopes": [
+      "api://916ace49-a3db-4b11-84c5-6c4bd20260ef/visualiser.read",
+      "api://916ace49-a3db-4b11-84c5-6c4bd20260ef/visualiser.write"
+    ]
+  }
+}