Move English documentation to folder en_US

doc/en_US/project-views.markdown

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+Board, Calendar and List Views
+==============================
+
+For each project, tasks can be visualized with several views: **Board, Calendar, List and Gantt**.
+Each view shows the result of the filter box at the top.
+The search engine uses the [advanced syntax](search.markdown).
+
+Board View
+----------
+
+![Board view](screenshots/board-view.png)
+
+- With this view, you can drag and drop tasks between columns easily.
+- You can also use the keyboard shortcut **"v b"** to switch to the board view.
+- Tasks with a shadow are recently modified.
+
+![Board Task Limit](screenshots/board-task-limit.png)
+
+When the task limit is reached for a column, the background becomes red. That means there are too many tasks in progress at the same time.
+
+[Learn more about board configuration](board-configuration.markdown)
+
+Calendar View
+--------------
+
+![Calendar view](screenshots/calendar-view.png)
+
+- With this view, you can visualize tasks with a due date.
+- Depending of the settings, you can also see tasks in progress.
+- You can also use the keyboard shortcut **"v c"** to switch to the calendar view.
+- [Learn more about calendar configuration](calendar-configuration.markdown)
+
+List View
+---------
+
+![List view](screenshots/list-view.png)
+
+- With this view, all results of your search are displayed in a table.
+- You can also use the keyboard shortcut **"v l"** to switch to the list view.
+
+Gantt View
+----------
+
+![Gantt view](screenshots/gantt-view.png)
+
+- The Gantt view displays tasks on a horizontal timeline.
+- The start date and the due date are used to display the chart.
+- For quick access, use the keyboard shortcut: **v g**.
+
+Project Overview
+----------------
+
+![Project overview](screenshots/project-view.png)
+
+- View the description of the project.
+- Attach and upload documents to the project.
+- View list of project members.
+- View the last activities of the project.