Update README.md

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

Author: FabianaCampanari

README.md

@@ -50,10 +50,13 @@ Feel free to explore, contribute, and share your insights!
 
 #
 
-2. **Albert Einstein (1905)**  
+2. [Albert Einstein]() **(1905)** <br>
+ ────────────── 
+
    * Explanation of the photoelectric effect, which introduced the concept of photons.
 
-   Formula for the photoelectric effect:  
+   Formula for the photoelectric effect:
+   
    $\huge \color{DeepSkyBlue} E_{photon} = h \cdot f = W + K$
 
    Where: