Add README.md

- A more detailed README will be added later in the new branch called
  'wiki'. This will have the branch comparison and examples on using
  this base app.

Author: ShyamQt

README.md

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+# PySide BaseApp
+
+This Flatpak base app is designed to be used for packaging Flatpak applications that use PySide,
+the official Python bindings for [Qt framework](https://www.qt.io/product/framework).