update readme

README.md

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 Application sources located at `src/app` folder, written by following principles:
 
-* Every file implement (extend) one of GTK 4 Widgets according to subject (e.g. `class Browser : public Gtk::ApplicationWindow`)
+* Every file implement (extend) one of GTK 4 Widgets, according to the functional subject (e.g. `class Browser : public Gtk::ApplicationWindow`)
 * `src/app` does not contain other class types like models or libraries (another folders and namespaces at `src` root are reserved for these needs)
 * Namespaces match filesystem path, where directory namespaces are lowercase
 * Every file work with it own, 1th level child only, to prevent massive logic levels keeping in mind