qtchooser: add page (#6079)

pages/linux/qtchooser.md

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+# qtchooser
+
+> A wrapper used to select between Qt development binary versions.
+> More information: <https://manned.org/qtchooser>.
+
+- List available Qt versions from the configuration files:
+
+`qtchooser --list-versions`
+
+- Print environment information:
+
+`qtchooser --print-env`
+
+- Run the specified tool using the specified Qt version:
+
+`qtchooser --run-tool={{tool}} --qt={{version_name}}`
+
+- Add a Qt version entry to be able to choose from:
+
+`qtchooser --install {{version_name}} {{path/to/qmake}}`
+
+- Display all available options:
+
+`qtchooser --help`