Warning for the installation instruction on README (#12025)

* warning for the installation instruction on README * Update README.md Co-authored-by: Jake Lishman <[email protected]> --------- Co-authored-by: Jake Lishman <[email protected]>
Qiskit · Apr 5, 2024 · b797a29 · b797a29
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@@ -20,6 +20,9 @@ For more details on how to use Qiskit, refer to the documentation located here:
 
 ## Installation
 
+> [!WARNING]
+> Do not try to upgrade an existing Qiskit 0.* environment to Qiskit 1.0 in-place. [Read more](https://docs.quantum.ibm.com/api/migration-guides/qiskit-1.0-installation).
+
 We encourage installing Qiskit via ``pip``:
 
 ```bash