Update README.md

Signed-off-by: Fabiana 🚀  Campanari <[email protected]>

Author: FabianaCampanari

README.md

@@ -256,7 +256,10 @@ Ramanujan's deep insights into infinite series and modular forms continue to inf
 
  Bose's work laid the groundwork for quantum statistics and particle behavior at near-zero temperatures. 
 
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+## Beginning of the 20th Century – Foundations of Quantum Mechanics
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 ### 6. [Max Planck]() (1900) <br>  ──────────────