Fix #737 - Add documenation for backend preview

Documentation/DeveloperManual/Index.rst

@@ -10,3 +10,4 @@ For developers
     Features/SpeakingUrl
     Bookings
     TypoScript
+    PageTSConfig

Documentation/DeveloperManual/PageTSConfig.rst

@@ -0,0 +1,25 @@
+..  include:: /Includes.txt
+
+PageTSConfig
+------------
+
+You can enable the generation of a preview link. Please configure the regular "detail" page of the indeces and link to the page including the "extensionConfiguration" parameter. EXT:calendarize will redirect you to the next index entry (to the last, if there is no future entry).
+
+..  code-block:: typoscript
+
+    TCEMAIN.preview {
+      tx_calendarize_domain_model_event {
+        # Your ID with the detail PID here
+        previewPageId = 22
+        useDefaultLanguageRecord = 0
+        fieldToParameterMap {
+          uid = tx_calendarize_calendar[event]
+        }
+        additionalGetParameters {
+          # Change this to your EXT:calendarize event
+          tx_calendarize_calendar.extensionConfiguration = Event
+          tx_calendarize_calendar.action = detail
+          tx_calendarize_calendar.controller = Calendar
+        }
+      }
+    }