chore(repo-management): add todomd file

TODO.md

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+# OAM TODO
+
+### Todo
+
+- [ ] Improve the [README] with more bells and whistles.<br/>
+  See [Make a README].
+
+### In Progress
+
+### Done ✓
+
+<!--
+  Reference time!
+  -->
+
+[make a readme]: https://www.makeareadme.com/
+[readme]: README.md

knowledge base/todomd.placeholder

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+# todomd
+
+[website]: https://github.com/todomd/todo.md