Include documentation in the application

doc/cli.markdown

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+Command Line Interface
+======================
+
+Kanboard provide a simple command line interface that can be used from any Unix terminal.
+This tool can be used only on the local machine.
+
+This feature is useful to run commands outside the web server process by example running a huge report.
+
+Usage
+-----
+
+- Open a terminal and go to your Kanboard directory (example: `cd /var/www/kanboard`)
+- Run the command `./kanboard`
+
+```bash
+Kanboard version master
+
+Usage:
+  command [options] [arguments]
+
+Options:
+  -h, --help            Display this help message
+  -q, --quiet           Do not output any message
+  -V, --version         Display this application version
+      --ansi            Force ANSI output
+      --no-ansi         Disable ANSI output
+  -n, --no-interaction  Do not ask any interactive question
+  -v|vv|vvv, --verbose  Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
+
+Available commands:
+  help                               Displays help for a command
+  list                               Lists commands
+ export
+  export:daily-project-column-stats  Daily project column stats CSV export (number of tasks per column and per day)
+  export:subtasks                    Subtasks CSV export
+  export:tasks                       Tasks CSV export
+  export:transitions                 Task transitions CSV export
+ locale
+  locale:compare                     Compare application translations with the fr_FR locale
+  locale:sync                        Synchronize all translations based on the fr_FR locale
+ notification
+  notification:overdue-tasks         Send notifications for overdue tasks
+ projects
+  projects:daily-stats               Calculate daily statistics for all projects
+```
+
+Available commands
+------------------
+
+### Tasks CSV export
+
+Usage:
+
+```bash
+./kanboard export:tasks <project_id> <start_date> <end_date>
+```
+
+Example:
+
+```bash
+./kanboard export:tasks 1 2014-10-01 2014-11-30 > /tmp/my_custom_export.csv
+```
+
+CSV data are sent to `stdout`.
+
+### Subtasks CSV export
+
+Usage:
+
+```bash
+./kanboard export:subtasks <project_id> <start_date> <end_date>
+```
+
+Example:
+
+```bash
+./kanboard export:subtasks 1 2014-10-01 2014-11-30 > /tmp/my_custom_export.csv
+```
+
+### Task transitions CSV export
+
+Usage:
+
+```bash
+./kanboard export:transitions <project_id> <start_date> <end_date>
+```
+
+Example:
+
+```bash
+./kanboard export:transitions 1 2014-10-01 2014-11-30 > /tmp/my_custom_export.csv
+```
+
+### Export daily summaries data in CSV
+
+The exported data will be printed on the standard output:
+
+```bash
+./kanboard export:daily-project-column-stats <project_id> <start_date> <end_date>
+```
+
+Example:
+
+```bash
+./kanboard export:daily-project-column-stats 1 2014-10-01 2014-11-30 > /tmp/my_custom_export.csv
+```
+
+### Send notifications for overdue tasks
+
+Emails will be sent to all users with notifications enabled.
+
+```bash
+./kanboard notification:overdue-tasks
+```
+
+You can also display the overdue tasks with the flag `--show`:
+
+```bash
+$ ./kanboard notification:overdue-tasks --show
++-----+---------+------------+------------+--------------+----------+
+| Id  | Title   | Due date   | Project Id | Project name | Assignee |
++-----+---------+------------+------------+--------------+----------+
+| 201 | Test    | 2014-10-26 | 1          | Project #0   | admin    |
+| 202 | My task | 2014-10-28 | 1          | Project #0   |          |
++-----+---------+------------+------------+--------------+----------+
+```
+
+Cronjob example:
+
+```bash
+# Everyday at 8am we check for due tasks
+0 8 * * *  cd /path/to/kanboard && ./kanboard notification:overdue-tasks >/dev/null 2>&1
+```
+
+### Run daily project stats calculation
+
+You can add a background task to calculate the project statistics everyday:
+
+```bash
+$ ./kanboard projects:daily-stats
+Run calculation for Project #0
+Run calculation for Project #1
+Run calculation for Project #10
+```