Create Python/quantum/README.md

Started at #1831

Author: cclauss

Diff for: quantum/README.md

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+# Welcome to Quatum Algorithms
+
+Started at https://github.com/TheAlgorithms/Python/issues/1831
+
+* D-Wave: https://www.dwavesys.com and https://github.com/dwavesystems
+* Google: https://research.google/teams/applied-science/quantum
+* IBM: https://qiskit.org and https://github.com/Qiskit
+* Rigetti: https://rigetti.com and https://github.com/rigetti