Add tutorial code for quantum computing basics tutorial

Author: martin-martin

quantum-computing-basics/README.md

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+# Quantum Computing Basics
+
+Code examples from the Real Python tutorial on [Quantum Computing Basics](https://realpython.com/quantum-computing-basics/).
+
+## Requirements
+
+- Python 3.11+
+- Dependencies from `pyproject.toml`
+
+## Running the Examples
+
+The main example creates a simple quantum circuit with a Hadamard gate and measurement.

quantum-computing-basics/pyproject.toml

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+[project]
+name = "quantum-computing-basics"
+version = "0.1.0"
+requires-python = ">=3.11"
+dependencies = [
+    "qiskit==2.1.1",
+    "matplotlib",
+    "pylatexenc",
+]

quantum-computing-basics/quantum_circuit.png

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+from qiskit import QuantumCircuit, QuantumRegister, ClassicalRegister
+
+qr = QuantumRegister(1, name="quantum")
+cr = ClassicalRegister(1, name="classical")
+qc = QuantumCircuit(qr, cr)
+
+qc.h(0)
+qc.measure(0, 0)
+
+qc.draw("mpl", filename="quantum_circuit.png")