Feat: adds TODO

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+# TODO
+
+* [ ] Open an issue on upstream [Newsboat issue tracker][newsboat-issues] for
+      supporting [OPML inclusion][opml-inclusion] ([example](inclusion-example)).
+      Currently, Newsboat exits with:
+
+        It looks like the OPML feed you subscribed contains no feeds. Please
+        fill it with feeds, and try again.
+
+[newsboat-issues]: https://github.com/newsboat/newsboat/issues
+[opml-inclusion]: http://opml.org/spec2.opml#1629042832000
+[inclusion-example]: http://hosting.opml.org/dave/spec/directory.opml