Add deprecation notice (#485)

discourse · Jun 12, 2022 · a40aabd · a40aabd
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+# :warning: This project isn't maintained anymore as the onebox library has [moved into core repository](https://github.com/discourse/discourse/tree/main/lib/onebox). If you wish to help by maintaining the project please contact [email protected].
+
 onebox
 ======