This is a documentation fixed.
I fixed the format, added a table of contents and two new sections for
installing the application as a first-time contributor and for the
application architecture.
I think these things are helpful for a newcomer to understand the way
the project works and we can enrich it with all the different components
of the app.
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Co-authored-by: TrianguloY <correo--correo@hotmail.com>