Add exercise of new course 30-days-of-python

Signed-off-by: Manuel Vergara <manuel@vergaracarmona.es>

30-days-of-python/23_Entorno_virtual/README.md

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+# Entorno virtual
+
+Documento original en inglés: [Virtual Environment](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/23_Day_Virtual_environment/23_virtual_environment.md)
+
+## Ejercicios
+
+...