Add documentation to create tasks

docs/creating-tasks.markdown

@@ -0,0 +1,24 @@
+Creating tasks
+==============
+
+From the board, click on the plus sign next to the column name:
+
+![Task creation from the board](http://kanboard.net/screenshots/documentation/task-creation-board.png)
+
+Then the task creation form appears:
+
+![Task creation form](http://kanboard.net/screenshots/documentation/task-creation-form.png)
+
+The only mandatory field is the title.
+
+Field description:
+
+- **Title**: The title of your task, that will be displayed on the board.
+- **Description**: Allow you to add more information about the task, the content can be written in [Markdown](http://kanboard.net/documentation/syntax-guide).
+- **Create another task**: Check this box if you want to create a similar task (fields will be prefilled).
+- **Assignee**: The person that will work on the task.
+- **Category**: Only one category can be assign to a task.
+- **Column**: The column where the task will be created, your task will be positioned at the bottom.
+- **Color**: Choose the color of the card.
+- **Complexity**: Used in agile project management (Scrum), the complexity or story points is a number that tells the team how hard the story is. Often, people use the fibonacci series.
+- **Due Date**: Overdue tasks will have a red due date and upcoming due dates will be black on the board. Several date format are accepted in addition to the date picker.

docs/syntax-guide.markdown

@@ -1,7 +1,7 @@
 Syntax Guide
 ============
 
-Kanboard use the [Markdown syntax](http://en.wikipedia.org/wiki/Markdown) to write comments or tasks description.
+Kanboard use the [Markdown syntax](http://en.wikipedia.org/wiki/Markdown) to write comments or task descriptions.
 Here are some examples:
 
 Bold and italic