todoman: add page

pages/common/todoman.md

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+# todoman
+
+> A simple, standards-based, cli todo manager.
+> `todoman` is a common name for the command `todo`, but not a command itself.
+> More information: <https://todoman.readthedocs.io/>.
+
+- View documentation for the actual command:
+
+`tldr todo`