feat: add .nvmrc to the project 🔧

[Jesus-Rojas]

.nvmrc is added to the project, making it easier to switch to the node version required by a given project.

Example:

unknown@unknown$ node -v
v14.20.0
unknown@unknown$ nvm use
Found '/home/unknown/portafolio_sebbasDev/.nvmrc' with version <v20.12.2>
Now using node v20.12.2 (npm v10.5.0)
unknown@unknown$ node -v
v20.12.2

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[Jesus-Rojas]

@sebbas-0626 merge this !!