Prompt user when moving or duplicate a task to another project

docs/duplicate-move-tasks.markdown

@@ -0,0 +1,58 @@
+Duplicate and move tasks
+========================
+
+Duplicate a task into the same project
+--------------------------------------
+
+Go to the task view and choose **Duplicate** on the left.
+
+![Task Duplication](http://kanboard.net/screenshots/documentation/task-duplication.png)
+
+A new task will be created with the same properties as the original.
+
+Duplicate a task to another project
+-----------------------------------
+
+Go to the task view and choose **Duplicate to another project**.
+
+![Task Duplication Another Project](http://kanboard.net/screenshots/documentation/task-duplication-another-project.png)
+
+Only projects where you are member will be shown in the dropdown.
+
+Before to copy the tasks, Kanboard will ask you the destination properties that are not common between the source and destination project.
+
+Basically, you need to define:
+
+- The destination swimlane
+- The column
+- The category
+- The assignee
+
+Move a task to another project
+------------------------------
+
+Go to the task view and choose **Move to another project**.
+
+Moving a task to another project work in the same way as the duplication, you have to choose the new properties of the task.
+
+List of fields duplicated
+-------------------------
+
+Here are the list of properties duplicated:
+
+- title
+- description
+- date_due
+- color_id
+- project_id
+- column_id
+- owner_id
+- score
+- category_id
+- time_estimated
+- swimlane_id
+- recurrence_status
+- recurrence_trigger
+- recurrence_factor
+- recurrence_timeframe
+- recurrence_basedate

docs/index.markdown

@@ -26,6 +26,7 @@ Using Kanboard
 
 - [Creating tasks](creating-tasks.markdown)
 - [Closing tasks](closing-tasks.markdown)
+- [Duplicate and move tasks](duplicate-move-tasks.markdown)
 - [Adding screenshots](screenshots.markdown)
 - [Task links](task-links.markdown)
 - [Transitions](transitions.markdown)