Update README.md

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

Author: FabianaCampanari

README.md

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  The formula presented, $\huge \color{DeepSkyBlue} |\Phi^+\rangle = \frac{1}{\sqrt{2}}(|00\rangle + |11\rangle)$, describes one of the most well-known entangled states, called a **Bell state** or **maximally entangled state**. This state is fundamental in quantum computing theory and quantum cryptography, as in the case of Artur Ekert's protocol.
 
+ - **$\huge |\Phi^+\rangle$**: Represents the quantum state vector in Dirac notation (also known as bra-ket notation). The state $|\Phi^+\rangle$ is one of the four Bell states, which are entangled qubit states.
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