Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

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 ## Table of Contents
 
+#### Table of Contents
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 #### I. [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
 1. [**Leonhard Euler (1748)**](#leonhard-euler-1748)  
 2. [**Carl Friedrich Gauss (1809)**](#carl-friedrich-gauss-1809)