todoman: add page (#6994)

pages/common/todoman.md

@@ -0,0 +1,24 @@
+# todoman
+
+> A simple, standards-based, cli todo manager.
+> More information: <https://todoman.readthedocs.io>.
+
+- Add a new task to the work list:
+
+`todo new {{thing_to_do}} --list {{work}}`
+
+- List startable tasks:
+
+`todo list --startable`
+
+- Mark a task as completed:
+
+`todo done {{task_id}}`
+
+- Show details about a task:
+
+`todo show {{task_id}}`
+
+- Delete a task:
+
+`todo delete {{task_id}}`