The Members List is maintained as a text file instead of MarkDown file

The [Members-List](https://github.com/codezoned/join_codezoned/blob/master/Members-List.txt) file in master branch is currently maintained as a standard plaintext file, which is visually lesser appealing as compared to the GitHub standard, MarkDown files (*.md).

I'd suggest using Markdown files instead, as they have better *formatting* and *text maintenance* options as compared to plaintext (*.txt) files. If community agrees, I won't mind renaming the file, and open another PR for the same. Please mention about your views 👀 on this.

Pre-Thanks for the same! 😃

Esamina prima Members-List.txt e la discussione esistente sull'issue, poiché la proposta richiede l'accordo della community. Se la modifica viene approvata, rinomina l'elenco dei membri in un file Markdown preservandone il contenuto, quindi conferma che il repository faccia riferimento al nuovo nome del file.

Scritto dal modello di indicizzazione a partire dal testo della issue.