Update README.md

README.md

@@ -35,6 +35,7 @@ The toolbox currently contains the following tools:
 - Circuit Cutting [[1-5]](#references)
 
 For a more detailed discussion on circuit cutting, check out our [technical guide](https://qiskit-extensions.github.io/circuit-knitting-toolbox/circuit_cutting/explanation/index.html#overview-of-circuit-cutting).
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 ### Documentation