docs: unmaintained banner

Author: mattyg

docs: add link to run test badge README.mddocs: add link to run test badge renamed to README.md

@@ -1,3 +1,10 @@
+> [!NOTE]
+> **This project is now community maintained by holochain-open-dev. It is no longer maintained directly by the Holochain Core Dev team.**
+> 
+> Tryorama can continue to be used with Holochain 0.6, but **support for Holochain 0.7+ should not be expected from the Holochain team**. For testing Holochain DNAs, the Holochain Core Dev team instead recommends using [sweettest](https://github.com/holochain/holochain/tree/develop/crates/hdk/src/sweetest), which is the test harness used in Holochain's own tests.
+>
+> See [this issue](https://github.com/holochain/holochain/issues/5546) for more information on the official maintenance status of downstream tools.
+
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