task: add page

pages/common/task.md

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+# task
+
+> TODO list manager.
+
+- Add new task:
+
+`task add {{thing_to_do}}`
+
+- List tasks:
+
+`task list`
+
+- Complete task:
+
+`task {{task_ID}} done`
+
+- Modify task:
+
+`task {{task_ID}} modify {{new_thing_to_do}}`
+
+- Delete task:
+
+`task {{task_ID}} delete`