Added my personal introduction to about-me.ipynb with Markdown improvement

[PaulinaMamiaga]

Added my personal introduction for the prework.

I included two versions:

1. the original code, and
2. an improved version using Markdown for a cleaner and more visually appealing output.

[PaulinaMamiaga]

Hi! I’ve completed the prework task and submitted my about-me.ipynb file.
The notebook includes two versions:
the original and an improved version using Markdown for a more polished output.